2-[(2S,4S,3R,6R)-4-(Dimethylamino)-3-hydroxy-6-methyl(2H-3,4,5,6-tetrahydropyran-2-yloxy)](5S,9S,19S,1R,2R,3R,8R,17R)-13-{[3-(6-amino(2-pyridyl))prop-2-ynyloxy]azamethylene}-8-ethyl-5-fluoro-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-180875 AIDS180875