17607-53-3 2,7-(Epoxypentadeca(1,11,13)trienimino)naphtho(2,1-b)furan-1,11(2H)-dione, 5,6,9,17,19,21-hexahydroxy-2,4,12,16,18,20,22-heptamethyl-23-methoxy-8-(3-methylpiperidinomethyl)-, 21-acetate Rifamycin SV, 8-(3-methylpiperidinomethyl)-