Novel Bacterial Triterpenoids of the Hopane Series from Nitrosomonas europaea and Their Significance for the Formation of the C35 Bacteriohopane Skeleton.

Abstract In addition to aminobacteriohopanetriol and adenosylhopane, three new hopanoids were isolated from the bacterium Nitrosomonas europaea: two N-acylaminobacteriohopanetriols, a hopanoid presenting a carbon carbon bond between ribonolactone and hopane and related to a putative intermediate involved in the formation of the C35 bacteriohopane skeleton and finally a condensation product between aminobacteriohopanetriol and trinorbacteriohopan-32-al, an artifact resulting from the autoxidation of the aminotriol.