Exhibit 3.4

SIXTH AMENDED AND RESTATED CERTIFICATE OF INCORPORATION

OF

ZYNERBA PHARMACEUTICALS, INC.

Zynerba Pharmaceuticals, Inc. (the “Corporation”), a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware, as the same may be amended from time to time (the “DGCL”), hereby certifies as follows:

FIRST: The name of the Corporation is Zynerba Pharmaceuticals, Inc.  The Corporation was originally incorporated under the name AllTranz Inc.  The original Certificate of Incorporation of the Corporation was filed with the Secretary of State of the State of Delaware on January 31, 2007.  The Certificate of Incorporation was amended and restated by the filing of a First Amended and Restated Certificate of Incorporation on June 20, 2007, a Second Amended and Restated Certificate of Incorporation on August 25, 2009, a Third Amended and Restated Certificate of Incorporation on October 10, 2012, an Amended and Restated Certificate of Incorporation on May 6, 2014, and an Amended and Restated Certificate of Incorporation on September 5, 2014.

SECOND: This Sixth Amended and Restated Certificate of Incorporation restates, integrates and amends the Certificate of Incorporation on file with the Secretary of State of Delaware immediately preceding the filing hereof, was duly adopted in accordance with the provisions of Sections 242 and 245 of the DGCL, and was approved by written consent of the stockholders of the Corporation given in accordance with the provisions of Section 228 of the DGCL (prompt notice of such action having been given to those stockholders who did not consent).

THIRD:   The text of the Certificate of Incorporation is hereby restated and amended to read in its entirety as follows:

ARTICLE I

The name of the Corporation is Zynerba Pharmaceuticals, Inc.

ARTICLE II

The address of the Corporation’s registered office in the State of Delaware is Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County of New Castle, 19801.  The name of its registered agent at that address is The Corporation Trust Company.

ARTICLE III

The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the DGCL.

ARTICLE IV
CAPITAL STOCK

The total number of shares of all classes of stock which the Corporation shall have authority to issue is 210,000,000 shares, consisting of (i) 200,000,000 shares of Common Stock, $0.001 par value per share (“Common Stock”), and (ii) 10,000,000 shares of Preferred Stock, $0.001 par value per share (“Preferred Stock”).

The following is a statement of the designations and the powers, privileges and rights, and the qualifications, limitations or restrictions thereof in respect of each class of capital stock of the Corporation.

A.                               COMMON STOCK.

1.                                      General.  The voting, dividend and liquidation rights of the holders of the Common Stock are subject to and qualified by the rights of the holders of the Preferred Stock of any series as may be designated by the board of directors of the Corporation (the “Board”) upon any issuance of the Preferred Stock of any series.

2.                                      Voting.  The holders of the Common Stock shall have voting rights at all meetings of stockholders, each such holder being entitled to one vote for each share thereof held by such holder; provided, however, that, except as otherwise required by law, holders of Common Stock shall not be entitled to vote on any amendment to this Certificate of Incorporation (which, as used herein, shall mean the certificate of incorporation of the Corporation, as amended from time to time, including the terms of any certificate of designations of any series of Preferred Stock) that relates solely to the terms of one or more outstanding series of Preferred Stock if the holders of such affected series are entitled, either separately or together as a class with the holders of one or more other such series, to vote thereon pursuant to this Certificate of Incorporation.  There shall be no cumulative voting.

When a quorum is present at any meeting, any matter to be voted upon by the stockholders at such meeting, other than the election of directors, shall be decided by the affirmative vote of a majority of the shares present in person or by proxy and entitled to vote on such matter (or if there are two or more classes or series of stock entitled to vote as separate classes, then in the case of each such class or series, the holders of a majority in voting power of the shares of stock of that class or series present or represented at the meeting and voting affirmatively or negatively on such matter), except when a different vote is required by law, this Certificate of Incorporation or the bylaws.  Any election by stockholders of directors shall be determined by a plurality of the shares present in person or by proxy entitled to vote on the election.

The number of authorized shares of Common Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority of the stock of the Corporation entitled to vote, irrespective of the provisions of Section 242(b)(2) of the DGCL.

3.                                      Dividends.  Dividends may be declared and paid on the Common Stock from funds lawfully available therefor as and when determined by the Board and subject to any preferential dividend or other rights of any then outstanding Preferred Stock.

4.                                      Liquidation.  Upon the dissolution or liquidation of the Corporation, whether voluntary or involuntary, holders of Common Stock will be entitled to receive all assets of the Corporation available for distribution to its stockholders, subject to any preferential or other rights of any then outstanding Preferred Stock.

5.                                      Certificates. Nothing in this Certificate of Incorporation limits or will be interpreted to limit the power of the Board under the DGCL to provide that some, any or all classes or series of capital stock of the Corporation shall be uncertificated.

2

B.                               PREFERRED STOCK.

Preferred Stock may be issued from time to time in one or more series, each such series to have such terms as stated or expressed herein and in the resolution or resolutions providing for the issue of such series adopted by the Board as hereinafter provided.  Any shares of Preferred Stock which may be redeemed, purchased or acquired by the Corporation may be reissued except as otherwise provided by law.

Authority is hereby expressly granted to the Board from time to time to issue the Preferred Stock in one or more series, and in connection with the creation of any such series, by adopting a resolution or resolutions providing for the issuance of the shares thereof and by filing a certificate of designations relating thereto in accordance with the DGCL, to determine and fix the number of shares of such series and such voting powers, full or limited, or no voting powers, and such designations, preferences and relative participating, optional or other special rights, and qualifications, limitations or restrictions thereof, including without limitation thereof, dividend rights, conversion rights, redemption privileges and liquidation preferences of such series, as shall be stated and expressed in such resolutions, all to the full extent now or hereafter permitted by the DGCL.  Without limiting the generality of the foregoing, the resolutions providing for issuance of any series of Preferred Stock may provide that such series shall be superior or rank equally or be junior to any other series of Preferred Stock to the extent permitted by law.

The number of authorized shares of Preferred Stock may be increased or decreased (but not below the number of shares of Preferred Stock then outstanding) by the affirmative vote of the holders of a majority of the voting power of the capital stock of the Corporation entitled to vote thereon, voting as a single class, irrespective of the provisions of Section 242(b)(2) of the DGCL.

ARTICLE V
STOCKHOLDER ACTION

1.                                      No Action without Meeting. Any action required or permitted to be taken by the stockholders of the Corporation at any annual or special meeting of stockholders of the Corporation must be effected at a duly called annual or special meeting of stockholders and may not be taken or effected by a written consent of stockholders in lieu thereof.

2.                                      Special Meetings. Except as otherwise required by statute and subject to the rights, if any, of the holders of any series of Preferred Stock, special meetings of the stockholders of the Corporation may be called only by the Board or by such person or persons requested by a majority of the Board to call such meetings, acting pursuant to a resolution approved by the affirmative vote of a majority of the directors then in office, and may not be called by any other person or persons. Only those matters set forth in the notice of the special meeting may be considered or acted upon at a special meeting of stockholders of the Corporation.

ARTICLE VI
DIRECTORS

1.                                      General Powers.  The business and affairs of the Corporation shall be managed by or under the direction of the Board.

2.                                      Number of Directors; Election of Directors.  Subject to the rights of holders of any series of Preferred Stock to elect directors, the number of directors of the Corporation shall be established by resolution duly adopted from time to time by the Board.  Elections of directors need not be by written ballot, except as and to the extent provided in the bylaws of the Corporation.

3

3.                                      Terms of Office.  Subject to the rights of holders of any series of Preferred Stock to elect directors, each director shall serve for a term ending on the date of the annual meeting of stockholders following the annual meeting of stockholders at which such director was elected; provided that the term of each director’s service shall continue until the election and qualification of his or her successor and be subject to his or her earlier death, resignation or removal.

4.                                      Quorum.  The greater of (i) a majority of the directors at any time in office and (ii) one-third of the number of directors fixed pursuant to Section 2 of this Article VI shall constitute a quorum of the Board.  If at any meeting of the Board there is less than such a quorum, a majority of the directors present may adjourn the meeting from time to time without further notice other than announcement at the meeting, until a quorum is present.

5.                                      Action at Meeting.  Every act or decision done or made by a majority of the directors present at a meeting duly held at which a quorum is present shall be regarded as the act of the Board unless a greater number is required by law or by this Certificate of Incorporation.

6.                                      Removal.  Subject to the rights of holders of any series of Preferred Stock, directors of the Corporation may be removed only (i) for cause and (ii) only by the affirmative vote of the holders of 662/3% or more of the outstanding shares of capital stock then entitled to vote at an election of directors. At least forty-five (45) days prior to any annual or special meeting of stockholders at which it is proposed that any director be removed from office, written notice of such proposed removal and the alleged grounds thereof shall be sent to the director whose removal will be considered at the meeting.

7.                                      Vacancies.  Subject to the rights, if any, of the holders of any series of Preferred Stock to elect directors and to fill vacancies in the Board relating thereto, any and all vacancies in the Board, however occurring, including, without limitation, by reason of an increase in the size of the Board, or the death, resignation, disqualification or removal of a director, shall be filled solely and exclusively by the affirmative vote of a majority of the remaining directors then in office, even if less than a quorum, and not by the stockholders. Any director appointed in accordance with the preceding sentence shall hold office until the next election of directors of the Corporation, subject to the election and qualification of a successor and to such director’s earlier resignation, death or removal. In the event of a vacancy in the Board, the remaining directors, except as otherwise provided by law, shall exercise the powers of the full Board until the vacancy is filled.

ARTICLE VII
LIMITATION OF LIABILITY; INDEMNIFICATION

1.                                      Limitation of Liability. Except to the extent that the DGCL prohibits the elimination or limitation of liability of directors for breaches of fiduciary duty, no director of the Corporation shall be personally liable to the Corporation or its stockholders for monetary damages for any breach of fiduciary duty as a director, notwithstanding any provision of law imposing such liability.  No amendment to or repeal of this provision shall apply to or have any effect on the liability or alleged liability of any director of the Corporation for or with respect to any acts or omissions of such director occurring prior to such amendment or repeal.  If the DGCL is amended to permit further elimination or limitation of the personal liability of directors, then the liability of a director of the Corporation shall be eliminated or limited to the fullest extent permitted by the DGCL as so amended.

2.                                      Indemnification. The Corporation will have the power to indemnify any person who was or is a party or is threatened to be made a party to, or testifies in, any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative in nature, by reason of the fact such person is or was a director, officer or employee or agent of the Corporation, or is

4

or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, employee benefit plan, trust or other enterprise, against expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding to the full extent permitted by the DGCL, and the Corporation may adopt bylaws or enter into agreements with any such person for the purpose of providing for such indemnification.

ARTICLE VIII
AMENDMENT OF BYLAWS

1.                                      Amendment by Directors. Except as otherwise provided by law, and subject to the terms of any series of Preferred Stock, the bylaws of the Corporation may be amended or repealed by the Board by the affirmative vote of a majority of the directors present at any regular or special meeting of the Board at which a quorum is present.

2.                                      Amendment by Stockholders. The bylaws of the Corporation may be amended or repealed at any annual meeting of stockholders, or special meeting of stockholders called for such purpose, by the affirmative vote of at least 662/3% of the outstanding shares of capital stock entitled to vote on such amendment or repeal, voting together as a single class; provided, however, that if the Board recommends that stockholders approve such amendment or repeal at such meeting of stockholders, such amendment or repeal shall only require the affirmative vote of the majority of the outstanding shares of capital stock entitled to vote on such amendment or repeal, voting together as a single class.

ARTICLE IX
AMENDMENT OF CERTIFICATE OF INCORPORATION

The Corporation reserves the right to amend or repeal this Certificate of Incorporation in the manner now or hereafter prescribed by statute and this Certificate of Incorporation, and all rights conferred upon stockholders herein are granted subject to this reservation. Whenever any vote of the holders of capital stock of the Corporation is required to amend or repeal any provision of this Certificate of Incorporation, and in addition to any other vote of holders of capital stock that is required by this Certificate of Incorporation, the bylaws or by law, such amendment or repeal shall require the affirmative vote of the majority of the outstanding shares of capital stock entitled to vote on such amendment or repeal, and the affirmative vote of the majority of the outstanding shares of each class of capital stock entitled to vote thereon as a class, at a duly constituted meeting of stockholders called expressly for such purpose; provided, however, that the affirmative vote of not less than 662/3% of the outstanding shares of capital stock entitled to vote on such amendment or repeal, and the affirmative vote of not less than 662/3% of the outstanding shares of each class of capital stock entitled to vote thereon as a class, shall be required to amend or repeal any provision of Article IV.B, Article V, Article VI, Article VII, Article VIII or Article IX of this Certificate.

ARTICLE X
FORUM

Unless the Corporation consents in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware shall, to the fullest extent permitted by law, be the sole and exclusive forum for: (a) any derivative action or proceeding brought on behalf of the Corporation; (b) any action asserting a claim of breach of a fiduciary duty owed by any director, officer or other employee of the Corporation to the Corporation or the Corporation’s stockholders; (c) any action asserting a claim against the Corporation or any director, officer or other employee of the Corporation arising pursuant to the DGCL, this Certificate of Incorporation or the Corporation’s bylaws; (d) any action to interpret, apply,

5

enforce or determine the validity of this Certificate of Incorporation or the Corporation’s bylaws; or (e) any action asserting a claim governed by the internal affairs doctrine, except as to each of (a) through (e) above, for any claim (A) as to which the Court of Chancery determines that there is an indispensable party not subject to the jurisdiction of the Court of Chancery (and the indispensable party does not consent to the personal jurisdiction of the Court of Chancery within ten days following such determination), (B) which is vested in the exclusive jurisdiction of a court or forum other than the Court of Chancery, or (C) for which the Court of Chancery does not have subject matter jurisdiction; provided, that, if and only if the Court of Chancery of the State of Delaware dismisses any such action for lack of jurisdiction, such action may be brought in another state court sitting in the State of Delaware or, if no state court located within the State of Delaware has jurisdiction, the federal district court for the District of Delaware.  If any provision or provisions of this Article X shall be held to be invalid, illegal or unenforceable as applied to any person or entity or circumstance for any reason whatsoever, then, to the fullest extent permitted by law, the validity, legality and enforceability of such provisions in any other circumstance and of the remaining provisions of this Article X (including, without limitation, each portion of any sentence of this Article X containing any such provision held to be invalid, illegal or unenforceable that is not itself held to be invalid, illegal or unenforceable) and the application of such provision to other persons or entities and circumstances shall not in any way be affected or impaired thereby. Any person or entity purchasing or otherwise acquiring any interest in shares of stock of the Corporation shall be deemed to have notice of and consented to the provisions of this Article X.

[Remainder of Page Intentionally Left Blank]

6

IN WITNESS WHEREOF, the undersigned has caused this Sixth Amended and Restated Certificate of Incorporation of Zynerba Pharmaceuticals, Inc. to be duly executed on behalf of the Corporation as of this     day of        , 2015.