p. 1489 - 1495
(2013/03/14)pyridine-2,3,5,6-tetracarboxamid
2,3,5,6-Pyridintetracarbonsaeure-tetramethylester
pyridine-2,3,5,6-tetracarboxylic acid
2,6-dimethyl-pyridine-3,5-dicarboxylic acid diethyl ester
diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate