4,9-Diethyl-8-hydroxy-8,9-dimethyl-6-(3-methyl-2-butenyl)-2-oxo-2,4,8,9,10,10c-hexahydro-5aH-furo[4,3,2-de]pyrano[2,3-h]chromen-10-yl acetate AIDS-152351 AIDS152351 NSC696133