| 6-amino-2-mercapto-5-methyl-4-pyrimidinecarboxylic aci |
| 2-thio-6-amino-5-methyl-4-carboxy pyrimidine |
| 1,2-dihydro-6-amino-5-methyl-2-thioxo-4-pyrimidinecarboxylic aci |
| 6-amino-2-mercapto-5-methyl-4-pyrimidinecarboxylic acid |
| 6-amino-2-mercapto-5-methylpyrimidine-4-carboxylic acid |
