A new coumarin from Calophyllum hosei

Abstract

A new coumarin, hoseimarin (1), together with four other xanthones, trapezifolizanthone (2), osajaxanthone (3), β-mangostin (4) and caloxanthone A (5), were isolated from the stem bark of Calophyllum hosei. The structures of these compounds were established by using spectroscopic analysis which included ¹H NMR, ¹³C NMR, COSY, DEPT, HMQC and HMBC experiments.

Keywords::

• Calophyllum hosei
• coumarin
• hoseimarin
• trapezifolixanthone

Acknowledgement

The authors wish to express their gratitude for the financial support from UPM and MOSTI under the Agri Science Fund as well as the SBC.