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5H-Pyrrolo[3,4-b]pyridine-5,7(6H)-dione ETHYL 2,4-DIMETHYLPYRIDINE-3-CARBOXYLATE 4-(BUTYLAMINO)-1-ETHYL-6-METHYL 1H-PYRAZOLO[3,4B]PYRIDINE-5-ETHYLCARBOXYLATE HYDROCHLORIDE Methyl 2-methylnicotinate 2,3-Pyridinedicarboxylic anhydride 2-Methylnicotinic acid 1 10-PHENANTHROLINE-5 6-DIONE 97 ETHYL 4-HYDROXY-2-PHENYLQUINOLINE-3-CARBOXYLATE