3-Amino-2,6-difluorobenzoic acid83141-11-130 % similar 2,6-Difluoro-4-hydroxybenzoic acid214917-68-730 % similar 3-Chloro-2-pyrazine-carboxylic acid27398-39-630 % similar 3-Methylpyrazine-2-carboxylic acid41110-28-530 % similar 3-Amino-2-pyrazinecarboxylic acid5424-01-130 % similar Imidazole-4,5-dicarboxylic acid570-22-930 % similar 4-Amino-1,2,5-oxadiazole-3-carboxylic acid78350-50-230 % similar