Benzenesulfonamide, 4-[(2-amino-6,7-dihydro-6-thioxo-1H-purin-8-yl)azo]-N-(4-methyl-2-pyrimidinyl)- Benzenesulfonamide, 4-[(2-amino-6-mercapto-1H-purin-8-yl)azo]-N-(4-methyl-2-pyrimidinyl)- NSC163578