3-(3-Oxo-1,3,4,5,6,7-hexahydro-2H-indazol-2-yl)-benzenecarboxylic acid2-(3-Carboxyphenyl)-1,2,4,5,6,7-hexahydro-3H-indazol-3-one3-(1,3,4,5,6,7-Hexahydro-3-oxo-2H-indazol-2-yl)benzoic acid3-(3-oxo-1,3,4,5,6,7-hexahydro-2H-indazol-2-yl)benzenecarboxylic acid