4,4,55-Tetramethyl-2-p-tolyl-1,2,-dioxaborolane deriv AIDS-113287 AIDS113287 Benzoic acid, 3,3'-[4-(3.beta.,5.alpha.)-cholestan-3-yl-1-butenylidene]bis[5-chloro-6-[4-dihydroxyborylbenzyloxy]-