1 NNV (1r,5as,6r)-1,2,5,5a,6,7-hexahydrophenazine-1,6-dicarboxylic acid 1.000 2 PXC Phenazine-1,6-dicarboxylic acid 1.000 3 GRI 6-formyl-9-methoxyphenazine-1-carboxylic acid 0.864 4 WUB (1r,10as)-1,2,10,10a-tetrahydrophenazine-1-carboxylic acid 0.850