Niacin activity of the niacin related compounds such as 3-cyanopyridine, pyridine 3-sulfonic acid, nicotinic acid N-oxide, and 6-hydroxynicotinic acid was investigated using rats. 3-Cyanopyridine, pyridine-3-sulfonic acid, and 6-hydroxynicotinic acid had not only niacin activity but also the antagonistic activity. Nicotinic acid N-oxide had niacin activity and the relative niacin activity to nicotinic acid was about 1/2 in molar ratio.
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