2,7-(Epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]- furan-1,11(2H)-dione, 5,6,9,17,19,21-hexahydro-23- methoxy-2,4,12,16,18,20,22-heptamethyl-8-[(4-methyl-1-piperazinyl)methyl]-, 21-acetate 4075-44-9 NSC145611 Rifamycin, 3-[(4-methyl-1-piperazinyl)methyl]-