(9R,10R)-8,8-Dimethyl-4-oxo-9,10-dihydro-4H,8H-pyrano[2,3-f]chromene-9,10-diyl bis(4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carboxylate) 3'R,4'R-Di-O-(-)-camphanoyl-2',2'-dimethyldidihydropyrano[2,3-f]chromone AIDS-088846 AIDS088846 DCP