Synonyms: Rifamycin B methylmorpholide;BRN 5418696;NSC143442;Morpholine, 4-(((1,2-dihydro-5,6,17,19,21-pentahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11-dioxo-2,7-(epoxypentadeca(1,1,13)trienimino)naphtho(2,1-b)furan-9-yl)oxy)acetyl)-5-methyl-, 21-acetate;cetyl]-3-methyl-;LS-92721;38123-18-1;Morpholine, 4-[[[(14E,24E)-21-(acetyloxy)-1,2-dihydro-5,6,17,19-tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11-dioxo-2,7-(epoxy[1,11,13]pentadecatrienoimino)naphtho[2,1-b]furan-9-yl]oxy]a