2-Methyl-3-oxo-4-butyl-6-amino-8-thioxopyrimido<3,4-b>-1,2,4-triazine
2-Methyl-3-oxo-4-propyl-6-amino-8-thioxopyrimido<3,4-b>-1,2,4-triazine
2-Methyl-3-oxo-4-p-nitrobenzyl-6-amino-8-thioxopyrimido<3,4-b>-1,2,4-triazine
2,4-Dimethyl-3-oxo-6-amino-8-thioxopyrimido<3,4-b>-1,2,4-triazine
2-Methyl-3-oxo-4-ethyl-6-amino-8-thioxopyrimido<3,4-b>-1,2,4-triazine