5,7,7-Trimethyl-2-(phenoxymethyl)-7H-[1,3,4]thiadiazolo[3,2-a]pyrimidine 66442-40-8 AIDS-129206 AIDS129206 NSC337583 Phenyl (5,7,7-trimethyl-7H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-2-yl)methyl ether