3-Mesityl-4-(3-mesityl-5-phenyl-1,4,2-dioxazol-5-yl)-4,5-dihydro-5-isoxazolyl methyl ether 3-Mesityl-5-(3-mesityl-5-methoxy-4,5-dihydro-4-isoxazolyl)-5-phenyl-1,4,2-dioxazole AIDS-140913 AIDS140913 NSC654948