Institution: | 1. Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444 (P.?R. China), Fax: (+86)‐21‐66134856;2. Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032 (P.?R. China), Fax: (+86)?21‐64166128 |