[] [[MAPLES AND CALDER LETTERHEAD] Our ref AEO\628564\3415033v2 Direct +852 2971 3081 Email alice.ooi@maplesandcalder.com Wuxi PharmaTech (Cayman) Inc. 288 Fute Zhong Road Waigaoqiao Free Trade Zone Shanghai 200131 People Republic of China 4 September 2009 Dear Sir Wuxi PharmaTech (Cayman) Inc. Company Registration Statement Commission Act Prospectus ADSs Shares Unissued Shares We act as Cayman Islands counsel for Wuxi PharmaTech (Cayman)] [September 4, 2009 WuXi PharmaTech (Cayman) Inc. 288 Fute Zhong Road Waigaoqiao Free Trade Zone Shanghai 200131, PRC Re: American Depositary Shares Representing Ordinary Shares of WuXi PharmaTech (Cayman) Inc. Ladies and Gentlemen: September 4, 2009 - Page 2 The above opinion is provided to the Company for the Company’s use in connection with the transactions that are the subject] [Commerce & Finance Law Offices 6F NCI Tower, A12 Jianguomenwai Avenue, Chaoyang District, Beijing, PRC; Postcode: 100022 Tel: (8610) 65693399 Fax: (8610) 65693838, 65693836, 65693837, 65693839 www.tongshang.com.cn E-mail Add: beijing@tongshang.com Website: September 4, 2009 WuXi PharmaTech (Cayman) Inc. 288 Fute Zhong Road Waigaoqiao Free Trade Zone Shanghai 200131 People’s Republic of China Dear Sirs: For the purposes of giving this] [CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in this Registration Statement on Form F-3 of our reports dated June 25, 2009, relating to the financial statements and financial statement schedule of WuXi PharmaTech (Cayman) Inc., and the effectiveness of WuXi PharmaTech (Cayman) Inc.’s internal control over financial reporting, appearing in the Annual Report]