5-[(4-Methylpiperazino)methyl]-2-thioxo-2,3-dihydro-4(1H)-pyrimidinone1-Methyl-4-[(4-oxo-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl)methyl]piperazine5-[(4-Methylpiperazin-1-yl)methyl]-4-oxo-2-thioxo-1,2,3,4-tetrahydropyrimidine2,3-Dihydro-5-[(4-Methylpiperazin-1-yl)methyl]-2-thioxopyrimidin-4(1H)-one