title: Calyxin H, Epicalyxin H, and Blepharocalyxins A and B, Novel Diarylheptanoids from the Seeds of Alpinia blepharocalyx
abstract: Four unprecedented diarylheptanoids-calyxin H (1) and epicalyxin H (2), possessing a diarylheptanoid unit and a chalcone moiety, and blepharocalyxins A (3) and B (4), possessing two diarylheptanoid units and a chalcone moiety-were isolated from the seeds of Alpiniablepharocalyx. The structures of 1-4, including absolute stereochemistry, were elucidated by spectroscopic means and after a consideration of their biogenesis.
authors.affiliation: Research Institute for Wakan-Yaku (Traditional Sino-Japanese Medicines), Toyama Medical and Pharmaceutical University, 2630-Sugitani, Toyama 930-01, Japan, National Research Institute of Police Science, 6 Sanban-cho, Chiyoda-Ku, Tokyo 102, Japan, and China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing, People's Republic of China.
authors.initials: JK
authors.lastname: Prasain
authors.initials: JX
authors.lastname: Li
authors.initials: Y
authors.lastname: Tezuka
authors.initials: K
authors.lastname: Tanaka
authors.initials: P
authors.lastname: Basnet
authors.initials: H
authors.lastname: Dong
authors.initials: T
authors.lastname: Namba
authors.initials: S
authors.lastname: Kadota