6-(2-Ethoxyphenyl)-3-phenyl-6,7-dihydro-5H-[1,2,4]triazolo[3,4-b][1,3,5]thiadiazine AIDS-151315 AIDS151315 Ethyl 2-(3-phenyl-5H-[1,2,4]triazolo[3,4-b][1,3,5]thiadiazin-6(7H)-yl)phenyl ether NSC691254