[PROXY STATEMENT OF THE COMPANY October 20, 2015 Shareholders of WuXi PharmaTech (Cayman) Inc. Re: Notice of Extraordinary General Meeting of Shareholders Dear Shareholder: You are cordially invited to attend an extraordinary general meeting of shareholders of WuXi PharmaTech (Cayman) Inc., an exempted company with limited liability incorporated under the laws of the Cayman Islands (the “Company”), to be held] [EXECUTION VERSION SECOND AMENDED AND RESTATED CONSORTIUM AGREEMENT THIS SECOND AMENDED AND RESTATED CONSORTIUM AGREEMENT Agreement Chairman ABG Boyu Initial Sponsors G&C Temasek Hillhouse PRC Ping An G&C IV Co-Founder Equity LP Yunfeng Sequoia Legend Capital SPDBI Principal Consortium Member Principal Consortium Members Party Sponsor Parties Sponsors WHEREAS Original Consortium Agreement Transaction Company NYSE Exchange Act WHEREAS A&R Consortium Agreement] [EXECUTION VERSION CONFIDENTIAL AMENDED AND RESTATED INTERIM INVESTORS AGREEMENT Agreement Chairman Management Roll-over Entity ABG Boyu Temasek Hillhouse Ping An G&C IV Co-Founder Equity LP Yunfeng Sequoia Legend Capital SPDBI Equity Sponsor Equity Sponsors Investor Investors Holdco Parent Merger Sub Parties Party This Amended and Restated Interim Investors Agreement (this “ RECITALS Original Interim Investors Agreement WHEREAS, on August 14,] []

[PRELIMINARY PROXY STATEMENT OF THE COMPANY [ ], 2015 Shareholders of WuXi PharmaTech (Cayman) Inc. Re: Notice of Extraordinary General Meeting of Shareholders Dear Shareholder: You are cordially invited to attend an extraordinary general meeting of shareholders of WuXi PharmaTech (Cayman) Inc., an exempted company with limited liability incorporated under the laws of the Cayman Islands (the “Company”), to be] []