16784-08-0 Acetamide, 2-[[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[1,11,13]trienimino)naphtho[2,1-b]furan-9-yl]oxy]-N-butyl-N-methyl-, 21-acetate NSC143432 Rifamycin B butylmethylamide Rifamycin, 4-O-[2-(butylmethylamino)-2-oxoethyl]-