5,6,11,17,19-Pentahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1-oxo-1,2-dihydro-2,8-(epoxy[1,11,13]tetradecatrieno)[1]benzofuro[4,5-g]quinazolin-21-yl acetate AIDS-166579 AIDS166579 N,15-Didehydro-15-deoxo-pyrimido[4,5-b]rifamycin SV