Ethyl 1-oxidopyridin-1-ium-3-carboxylate
Diazenyl-(1-hydroxypyridin-4-ylidene)methanol
8-chloro-1-oxido-5,6-dihydrobenzo[1,2]cyclohepta[2,4-b]pyridin-1-ium-11-one
7-Hydroxy-6-methylpyrrolo[2,3-B]pyridine
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