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Our studies of the microbial-metabolism of triterpenoid ursolic acid by various Nocardia sp. strains, have led to the proposal of two novel pathways to produce triterpenoid derivatives. Nocardia sp. NRRL 5646, Nocardia sp. 44822 and Nocardia sp. 44000 generated the following ursolic acid derivatives: ursolic acid methyl ester, ursonic acid, ursonic acid methyl ester, 3-oxoursa-1,12-dien-28-oic acid...
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