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PYRIDINE-3,4-DICARBOXYLIC ANHYDRIDE Felodipine dimethyl 4-chloropyridine-2,6-dicarboxylate Diethyl 4-bromopyridine-2,6-dicarboxylate Diethyl 4-iodo-2,6-pyridinedicarboxylate DIETHYL 4-CHLORO-2,6-PYRIDINEDICARBOXYLATE diethyl 4-(2-furyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate Dimethyl 2,4-pyridinedicarboxylate