(12E,22E,24Z)-6,10,18,20-tetrahydroxy-1'-isobutyl-14-methoxy-7,9,15,17,19,21,25-heptamethyl-5,26-dioxo-3,5,9,10-tetrahydrospiro[9,4-(epoxypentadeca[1,11,13]trienoimino)furo[2',3':7,8]naphtho[1,2-d]imi 4-deoxy-3,4-[2-spiro-(N-isobutyl-4-piperidyl)]imidazo-(2,5-dihydro)-11-hydroxyrifamycin S InChI=1/C46H64N4O11/c1-22(2)21-50-18-16-46(17-19-50)48-34-31-32-39(54)28(8)42-33(31)43(56)45(10,61-42)59-20-15-30(58-11)25(5)41(60-29(9)51)27(7)38(53)26(6)37(52)23(3)13-12-14-24(4)44(57)47-36(40(32)55)35(34)49-46/h12-15,20,22-23,25-27,30,37-38,41,43,49, rifabutinol