JOINT FILING AGREEMENT

EXHIBIT 13

JOINT FILING AGREEMENT

THIS JOINT FILING AGREEMENT is entered into as of April 26, 2011, by and among the parties signatories hereto. The undersigned hereby agree that the Amendment No. 3 to the Statement on Schedule 13D/A with respect to the shares of Common Stock, par value $0.0001 per share, of Synutra International, Inc., a Delaware corporation, is, and any amendment thereafter signed by each of the undersigned shall be, filed on behalf of each undersigned pursuant to and in accordance with the provisions of 13d-1(k) under the Securities Exchange Act of 1934, as amended.

	WARBURG PINCUS PRIVATE EQUITY IX, L.P.
	By: Warburg Pincus IX LLC, its General Partner,
	By: Warburg Pincus Partners, LLC, its Sole Member,
	By: Warburg Pincus & Co., its Managing Member
	By:	/s/ Xxxxx X. Xxxxxxx
		Name: Xxxxx X. Xxxxxxx
		Title: Partner
	WARBURG PINCUS IX LLC
	By: Warburg Pincus Partners, LLC, its Sole Member,
	By: Warburg Pincus & Co., its Managing Member
	By:	/s/ Xxxxx X. Xxxxxxx
		Name: Xxxxx X. Xxxxxxx
		Title: Partner
	WARBURG PINCUS PARTNERS, LLC
	By: Warburg Pincus & Co., its Managing Member
	By:	/s/ Xxxxx X. Xxxxxxx
		Name: Xxxxx X. Xxxxxxx
		Title: Partner
	WARBURG PINCUS & CO.
	By:	/s/ Xxxxx X. Xxxxxxx
		Name: Xxxxx X. Xxxxxxx
		Title: Partner

	WARBURG PINCUS LLC
	By:	/s/ Xxxxx X. Xxxxxxx
		Name: Xxxxx X. Xxxxxxx
		Title: Managing Director
	XXXXXXX X. XXXX
	By:	/s/ Xxxxxxx X. Xxxx
		Name: Xxxxxxx X. Xxxx
		By: Xxxxx X. Xxxxxxx, Attorney-in-Fact*
	XXXXXX X. XXXXX
	By:	/s/ Xxxxxx X. Xxxxx
		Name: Xxxxxx X. Xxxxx
		By: Xxxxx X. Xxxxxxx, Attorney-in-Fact**

* Power of Attorney given by Xx. Xxxx was previously filed with the Commission on March 2, 2006 as an exhibit to the Schedule 13D filed by Building Products, LLC with respect to Builders FirstSource, Inc.

** Power of Attorney given by Xx. Xxxxx was previously filed with the Commission on March 2, 2006 as an exhibit to the Schedule 13D filed by Building Products, LLC with respect to Builders FirstSource, Inc.