1,4-Dideoxy-1,4-dihydro-1,4-dioxorifamycin 13553-79-2 2,7-(Epoxypentadeca(1,11,13)trienimino)naphtho(2,1-b)furan-1,6,9,11(2H)-tetrone, 5,17,19,21-tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-, 21-acetate BRN 0604802 EINECS 236-938-4 NCI 144-130 NSC 144130 Rifamycin S Rifamycin, 1,4-dideoxy-1,4-dihydro-1,4-dioxo- Rifomycin S