Benzenesulfonamide, 4-[(2-amino-6,7-dihydro-6-thioxo-1H-purin-8-yl)azo]-N-2-pyrimidinyl- Benzenesulfonamide, 4-[(2-amino-6-mercapto-1H-purin-8-yl)azo]-N-2-pyrimidinyl- NSC163569