6-methyl-1-oxo-1,2,3,4-tetrahydro-1λ4-[1,2,3]thiadiazolo[4,5-d]pyrimidine-5,7-dione

3,6-dimethyl-1-oxo-1,2,3,4-tetrahydro-1λ4-[1,2,3]thiadiazolo[4,5-d]pyrimidine-5,7-dione

3-ethylamino-6,8-dimethyl-1H,8H-pyrimido[4,5-e][1,3,4]thiadiazine-5,7-dione

6-hydrazino-1,3-dimethyl-2-thioxo-2,3-dihydro-1H-pyrimidin-4-one

6-[amino(methyl)amino]-1,3-dimethylpyrimidine-2,4-dione