Neutral lipids of bark of the roots of Maclura aurantica

The air-dry comminuted bark of the roots (4 kg) of osage orange was extracted with petroleum ether (40-70°C). When the extract was evaporated, yellow crystals deposited with mp 182-183°C, composition C23H2=06, which, on the basis of their IR, UV, and PMR spectra, were identified as 12-(l,l-dimethylallyl)-5,9,10-trihydroxy-2,2-dimethyl-2H,6H-pyrano[3,2b]xanthen-l-one (macluraxanthone); yield 0.04% [i].