pyranoxanthone Calophyllum venulosum 2 Clusiaceae 2 venuloxanthone 2 AGENTS 1 Article 1 CONSTITUENTS 1 COUMARINS 1 Calophyllum 1 Calophyllum buxifolium 1 Calophyllum venulosum extract 1 Fourier transform infrared photoacoustic spectroscopy 1 INOPHYLLUM 1 Molecular Structure 1 Nuclear Magnetic Resonance, Biomolecular 1 Plant Bark 1 Pyrans 1 Triterpenes 1 XANTHONES 1 Xanthones 1 ananixanthone 1 bark 1 buxixanthone 1 caloxanthone I 1 carbon nuclear magnetic resonance 1 carbonyl derivative 1 chemical structure 1 chemistry 1 crystal structure 1 drug formulation 1