Lanostane-triterpenoids from the fungus Phellinus gilvus

Triterpenoids gilvsins A-D (1-4) were isolated from the fruiting body of Phellinus gilvus, together with two known compounds. The structures of 1-4 were deduced from spectroscopic evidence. The absolute configuration at C-22 of 1 was determined by the modified Mosher's method and the structure of 1 was confirmed by X-ray analysis.