Prokaryotic triterpenoids: O-alpha-D-glucuronopyranosyl bacteriohopanetetrol, a novel hopanoid from the bacterium Rhodospirillum rubrum.

A novel hopanoid bearing a glucuronopyranosyl residue linked via an alpha-glycosidic bond to the hydroxyl group of C-35 in bacteriohopanetetrol was isolated, from the type strain of Rhodospirillum rubrum as well as from a mutant lacking blue carotenoid.