Synonyms: 1,3-Diazinane-2-thione;1,4,5,6-Tetrahydro-2-pyrimidinethiol; 2-Mercapto-1,4,5,6-tetrahydropyrimidine;2-Mercapto-3,4,5,6-tetrahydropyrimidine; 2-Mercaptotetrahydropyrimidine;3,4,5,6-Tetrahydro-1H-pyrimidine-2-thione;3,4,5,6-Tetrahydro-2(1H)-pyrimidinethione;3,4,5,6-Tetrahydro-2-mercaptopyrimidine; 3,4,5,6-Tetrahydro-2-pyrimidinethiol;Cyclic propylene thiourea; Hexahydropyrimidine-2-thione;N,N'-Trimethylenethiourea; NSC 21316; Perhydropyrimidine-2-thione;Tetrahydropyrimidine-2-thione; Thiourea, N,N'-1,3-propanediyl-;Trimethylenethiourea