1. State Key Laboratory of Bio-Organic and Natural Products ChemistryCenter for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of Sciences 345 Ling Ling Road Shanghai 200032 China
2. Chemical Research and DevelopmentPfizer Global R&D Eastern Point Road Groton CT 06340 USA
3. Chemical Research and Applied Synthetic TechnologiesPfizer Global R&D Eastern Point Road Groton CT 06340 USA