[securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. (Continued on the Following Pages) 1. NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Kylin Fund LP 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ]]

[Item 1: Reporting Person - FMR LLC Item 4: Delaware Item 5: 71,014,312 Item 6: 0 Item 7: 74,603,112 Item 8: 0 Item 9: 74,603,112 Item 11: 13.134% Item 12: HC Cusip #G98079109 Item 1: Reporting Person - Edward C. Johnson 3d Item 5: 0 Item 6: 0 Item 7: 74,603,112 Item 8: 0 Item 9: 74,603,112 Item 11: 13.134%]

[SCHEDULE 13G (Amendment No. 3)* WuXi PharmaTech (Cayman) Inc. (Name of Issuer) Ordinary Shares, par value $0.02 per share (Title of Class of Securities) 929352102 (CUSIP Number) December 31, 2011 (Date of Event Which Requires Filing of this Statement) o Rule 13d-1(b) o Rule 13d-1(c) x Rule 13d-1(d) *The remainder of this cover page shall be filled out for a]