13-((2E)-3-Phenylprop-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)]-18-(3-amino-2-oxo-1-azapropylidene)-8-ethyl-9-hydroxy-1,3,5,9,17,19-hexamethyl-7,11,15-trioxabicyclo[8.5.4]nonadecane-4,6-dione AIDS-184251 AIDS184251