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Updated: May 21, 2026

High-resolution Tandem Mass Spectrometry for Studying Chemical Constituents of Gynura bicolor DC
Published on: February 2, 2024
Cuspidans A and B, two new stilbenoids from the bark of Gnetum cuspidatum
Yoko Shimokawa1, Yusuke Hirasawa, Toshio Kaneda
1Faculty of Pharmaceutical Sciences, Hoshi University, Shinagawa-ku, Tokyo, Japan.
Abstract:
Cuspidan A (1), a new stilbene sestermer consisting of a resveratrol, an oxyresveratrol, and a 3,5-dihydroxyphenylmethanol constituent units and cuspidan B (2), a new tri-cyclic stilbene monomer were isolated from the bark of Gnetum cuspidatum. The structures and configurations of 1 and 2 were elucidated on the basis of 2D-NMR correlations.
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