9-Oxo-7-thia-2,5-diazatricyclo[6.4.0.0,2,6]dodeca-1(8),3,5-triene-4-carboxylic acid 1g

9-Oxo-7-thia-2,5-diazatricyclo[6.4.0.0,2,6]dodeca-1(8),3,5-triene-4-carboxylic acid 1g