5,6-diamino-1H-pyrimidine-4-thione, 4-thio-5,6-diaminopyrimidine, 4,5-diaminopyrimidine-6-thiol, 4,5-DIAMINO-6-MERCAPTOPYRIMIDINE, 4(1H)-Pyrimidinethione, 5,6-diamino-; 5,6-diamino-4(1H)-pyrimidinethione; 5,6-diamino-3H-pyrimidine-4-thione; 5,6-Diaminopyrimidine-4-thiol; 4-Mercapto-5,6-diaminopyrimidine; 5,6-diamino-3,4-dihydropyrimidine-4-thione;