4-Methoxy-7-phenyl-7H-[1,2,3]triazolo[4,5-e][2,1,3]benzoxadiazole AIDS-143343 AIDS143343 Methyl 7-phenyl-7H-[1,2,3]triazolo[4,5-e][2,1,3]benzoxadiazol-4-yl ether NSC663956