Ethyl 1H-pyrrolo[3,2-b]pyridine-5-carboxylate
Ethyl 1H-pyrrolo[3,2-b]pyridine-3-carboxylate
Ethyl 1H-pyrrolo[3,2-b]pyridine-2-carboxylate
Ethyl 2-chloro-3-nitropyridine-5-carboxylate
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