38123-18-1 BRN 5418696 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 Rifamycin B methylmorpholide