WuXi PharmaTech (Cayman) Inc. ("WuXi" or the "Company") (NYSE: WX), a leading open-access R&D capability and technology platform company serving the pharmaceutical, biotechnology, and medical device industries with operations in China and the United States, today announced that it has entered into a definitive Agreement and Plan of Merger (the "Merger Agreement") with New WuXi Life Science Limited ("Parent") and WuXi Merger Limited ("Merger Sub"), a wholly owned subsidiary of Parent.