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Updated: Mar 28, 2026

Screening and Isolation of C-Glycoside-Cleaving Intestinal Bacteria
Published on: February 28, 2025
A new flavone C-glycoside and a new bibenzyl from Bulbophyllum retusiusculum
Ming-Hui Yang1,2, Yun-Shan Fang2,3, Le Cai2
1a School of Pharmaceutical Sciences and Chemistry , Dali University , Dali , P.R. China.
Abstract:
A new flavone C-glycoside, apigenin 6-C-α-arabinofuranosyl 8-C-α-arabinopyranoside (1) and a new bibenzyl, bulbotetusine (2), were isolated from the tubers of Bulbophyllum retusiusculum. Their structures were established on the basis of extensive spectroscopic analyses. The absolute configuration of 2 was determined by the comparison of experimental and calculated electronic circular dichroism. Compounds 1 and 2 showed no obvious cytotoxic activity against any five human tumour cell lines with IC50 values >40 μM.
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