13-[(2E)-3-(4-Nitrophenyl)prop-2-enylidene](9S,19S,1R,2R,3R,5R,8R,17R)-2-[(2S,4S,3R,6R)-4-(dimethylamino)-3-hydroxy-6-methyl(2H-3,4,5,6-tetrahydropyran-2-yloxy)]-8-ethyl-9-hydroxy-1,3,5,9,17,19-hexamethyl-18-(2-oxo-1-azapropylidene)-7,11,15-trioxabicyclo[8.5.4]nonadecane-4,6-dione AIDS-184255 AIDS184255