2,7-(Epoxypentadeca(1,11,13)trienimino)naphtho(2,1-b)furan-1,11(2H)-dione, 3-formyl-5,6,9,17,19,21-hexahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-, 21-acetate, O-(hept-2-yl)oxime 3-Formylrifamycin SV O-(hept-2-yl)oxime 41776-73-2 BRN 5418483