dimethyl5-methyl-2,3-pyridinedicarboxylate, 5-methyl-1H-pyrazole-3,4-dicarboxylic acid dimethyl ester, dimethyl 5-methylpyridine-2,3-di-carboxylate, 5-methyl-1(2)H-pyrazole-3,4-dicarboxylic acid dimethyl ester, 5-methyl-2,3-pyridinedicarboxylic acid dimethyl ester, 5-Methyl-pyrazol-3,4-dicarbonsaeure-dimethylester, 1H-Pyrazole-3,4-dicarboxylic acid,5-methyl-,dimethyl ester