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■ New Constituents from the Roots of Erythrina x bidwillii

Hitoshi Tanaka,* Hisanori Hattori, Masaru Sato, Ryozo Yamaguchi, Toshio Fukai, Toshihiro Tanaka, and Eiji Sakai

*Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan

Abstract

Three new compounds, erythbidins C-E (1-3), together with five known compounds 4-8 were isolated from the roots of Erythrina x bidwillii. Their structures were established on the basis of spectroscopic evidence. Among the isolated compounds, erythbidin E (3) showed a potent antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA).