Exhibit 8.1

LIST OF SUBSIDIARIES

• WuXi AppTec (BVI) Inc., incorporated in British Virgin Islands;

• WuXi AppTec Co., Ltd., incorporated in People’s Republic of China (“PRC”);

• WuXi AppTec (Shanghai) Co., Ltd., incorporated in PRC;

• Shanghai SynTheAll PharmaTech Co., Ltd., incorporated in PRC;

• WuXi AppTec (Suzhou) Co., Ltd., incorporated in PRC;

• WuXi AppTec (Tianjin) Co., Ltd. , incorporated in PRC;

• WuXi AppTec Holding Company,Inc., incorporated in United States of America (“United States”);

• WuXi AppTec, Inc., incorporated in United States;

• WX (BVI) Ltd., incorporated in British Virgin Islands;

• Kaipara Enterprises Ltd., incorporated in the Republic of Cyprus;

• Klivia Investments Sp. Z o.o., incorporated in the Republic of Poland;

• WuXi AppTec Biotechnology Co.,Ltd., incorporated in PRC;

• WuXi AppTec (Wuhan) Co., Ltd., incorporated in PRC;

• Shanghai AppTec(HK) Ltd., incorporated in Hong Kong;

• Global Bond Investments Ltd., incorporated in Hong Kong;

• Chemdepo, Inc., incorporated in United States;

• WuXi AppTec UK, Inc., incorporated in United Kingdom;

• WuXi AppTec Sales, LLC., incorporated in United States;

• STA Pharmaceutical Hong Kong Ltd., incorporated in Hong Kong;

• Shanghai STA Pharmaceutical R&D Co., Ltd., incorporated in PRC;

• WuXi PharmaTech Investment Holdings (Cayman) Inc., incorporated in United States;

• WuXi PharmaTech Investments (Cayman) Inc., incorporated in Cayman Islands;

• WuXi PharmaTech Fund I General Partner L.P., incorporated in Cayman Islands;

• WuXi PharmaTech Investment Management (Cayman) Inc., incorporated in Cayman Islands;

• WuXi PharmaTech Healthcare Fund I L.P., incorporated in Cayman Islands;

• Wuxi AppTec Investment & Development Co., Ltd., incorporated in PRC;

• WuXi AppTec Biomedical Investment Management L.P., incorporated in PRC;

• WuXi AppTec Equity Investment Management Co., Ltd., incorporated in PRC;

• WuXi AppTec Investment Fund I L.P., incorporated in PRC;

• WuXi AppTec Clinical Research and Regulatory Services Co. Ltd., incorporated in PRC;

• Abgent, Inc., incorporated in United States;

• Abgent Europe Ltd., Incorporated in United Kingdom

• Abgent Biotechnology (Shanghai) Co., Ltd., incorporated in PRC;

• Abgent Biotechnology (Suzhou) Co., Ltd., incorporated in PRC;

• MedKey Med-Tech Development Co., Ltd., incorporated in PRC;

• Jiecheng Med-Tech Development Co., Ltd., incorporated in PRC;

• WuXi AppTec (Changzhou) Co., Ltd., incorporated in PRC;

• WuXi AppTec (Nanjing) Testing Technology Co.,Ltd., incorporated in PRC