Any chemical compound having a pyridine ring with a carboxyl group attached to it at any position

4 vitamins - without reserve.

Niacin in vascular disorders and hyperlipemia / compiled and edited by Rudolf Altschul ; with contributions by Rudolf Altschul [and others].

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Nicotinic Acids

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Niacin in vascular disorders and hyperlipemia / compiled and edited by Rudolf Altschul ; with contributions by Rudolf Altschul [and others].

4 vitamins - without reserve.