Novel Diarylheptanoids from the Seeds of Alpinia blepharocalyx: Revised Structure of Calyxin A

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Jeevan Kumar Prasain, Yasuhiro Tezuka, Jian-Xin Li, Ken Tanaka, Purusotam Basnet, Hui Dong, Tsuneo Namba and Shigetoshi Kadota


Abstract

Calyxins A (1), E (2) and F (3), 6-hydroxycalyxin F (4), Calyxin G and epicalyxin G (5 and 6), novel diarylheptanoids having a chalcone or a flavanone moiety, were isolated from Alpinia blepharocalyx K. Schum. and their structures, including the corrected one of calyxin A (1), were elucidated by spectroscopic methods.


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