Synonyms: 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- (8CI);25-Deacetylrifamycin S; 25-Desacetylrifamycin S; 25-O-Deacetylrifamycin S;25-O-Desacetylrifamycin S; Deacetylrifamycin S