7-Oxo-6,7-dihydro-5h-cyclopenta[b]pyridine-3-carbonitrile
7-Hydroxy-6,7-dihydro-5h-cyclopenta[b]pyridine-3-carbonitrile
3-Chloro-6,7-dihydro-5h-cyclopenta[b]pyridin-7-amine
3-Bromo-5h-cyclopenta[b]pyridin-7(6h)-one
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