Chemical studies on the constituents of Hyphear tanakae HOSOKAWA from different host trees.

The chemical constituents of Hyphear Tanakae HOSOKAWA epiphyting to four different host trees were examined. A new triterpene fatty acid ester (III) and four known flavonoid glycosides, rhamnocitrin-3-O-rhamnoside (V), kaempferol-3-O-rhamnoside (VI), rhamnetin-3-O-rhamnoside (VII), and quercetin-3-O-rhamnoside (VIII) have been isolated from the leaves and twigs of this plant epiphyting to Castanea creanata SIEB., together with fatty acids (I), phytosterol (II), and phytosterol-glucoside (IV). The present investigation has revealed that compounds II-V, VII, and VIII are contained in this plant irrespective of the host, among the four host trees., examined.