(3R,4S,6R,7R)-3-Hydroxy-2,2,6,7-tetramethyl-8,10-dioxo-12-propyl-3,4,7,8-tetrahydro-2H,6H,10H-dipyrano[2,3-f:2',3'-h]chromen-4-yl 3-chlorobenzoate AIDS-163980 AIDS163980