JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)

Exhibit 1

JOINT FILING AGREEMENT
PURSUANT TO RULE 13d-1(k)

The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that it knows that such information is inaccurate.

Dated: June 7, 2018.

		/s/ Xxx Xxxx
		Xxx Xxxx
	DEXXON HOLDINGS LTD.
	By:	/s/ Xxx Xxxx
		Name: Xxx Xxxx
		Title: Director
	DEXCEL PHARMA TECHNOLOGIES LTD.
	By:	/s/ Xxx Xxxx
		Name: Xxx Xxxx
		Title: President and Chief Executive Officer