4-Methyl-2-oxo-6-thia-1,8-diazatricyclo[7.3.0.0,3,7]dodeca-3(7),4,8-triene-5-carboxylic acid 5g

4-Methyl-2-oxo-6-thia-1,8-diazatricyclo[7.3.0.0,3,7]dodeca-3(7),4,8-triene-5-carboxylic acid 5g