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Abstract
A new pyranoxanthone, venuloxanthone (1), was isolated from the stem bark of Calophyllum venulosum, together with three other xanthones, tovopyrifolin C (2), ananixanthone (3) and caloxanthone I (4), along with two common triterpenes, friedelin (5) and lupeol (6). The structures of these compounds were identified using several spectroscopic analyses which are NMR, GCMS and FTIR experiments.
Acknowledgment
The Sarawak Biodiversity Centre is acknowledged.
Disclosure statement
No potential conflict of interest was reported by the authors.
Additional information
Funding
The authors express their gratitude for the financial support from UPM under the RUGS Research Fund.