Synonyms: 2,7-(Epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]furan-8-carboxaldehyde,1,2-dihydro-5,6,9,17,19,21-hexahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11-dioxo-,8-(methylhydrazone), 21-acetate (7CI,8CI); Rifamycin, 3-[(methylhydrazono)methyl]-(9CI); NSC 267232