Rifamycin, 1,4-dideoxy-1,4-dihydro-1,4-dioxo-

5,17,19,21-tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-21-aceta

2,7-(epoxypentadeca(1,11,13)trienimino)naphtho(2,1-b)furan-1,6,9,11(2h)-tetron

5,17,19,21-Tetrahydroxy-23-Methoxy-2,4,12,16,18,20,22-heptaMethyl-2,7-(epoxypentadeca[1,11,13]trieniMino)naphtho[2,1-b]furan-1,6,9,11(2H)-tetrone 21-Acetate