4-(5,7,7-Trimethyl-7H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-2-yl)aniline 4-(5,7,7-Trimethyl-7H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-2-yl)phenylamine AIDS-137077 AIDS137077 NSC640624