Yazawa K, Mikami Y, Maeda A, Morisaki N, Iwasaki S
Research Center for Pathogenic Fungi and Microbial Toxicoses, Chiba University, Japan.
J Antimicrob Chemother. 1994 Jun;33(6):1127-35. doi: 10.1093/jac/33.6.1127.
Rifampicin was inactivated by Nocardia otitidiscaviarum to yield two products designated RIP-3 and RIP-4. The full structures of RIP-3 and RIP-4 were determined to be 21-(O-phosphoryl) rifampicin and 3-formyl-21-(O-phosphoryl) rifamycin SV, respectively, but neither product had any antimicrobial activity.