2829-57-4 6-Amino-8-thiapurine 7-Amino[1,2,5]thiadiazolo[3,4-d]pyrimidine NSC34454 [1,2,5]Thiadiazolo[3,4-d]pyrimidin-7-amine [1,2,5]Thiadiazolo[3,4-d]pyrimidine, 7-amino-