Niacinamide on a substance analysis report
Niacinamide (C6H6N2O) is a bitter crystalline amide of the vitamin B complex formed from and converted to niacin in the living organism.
In 2370, niacinamide was part of a "herbal beverage" that Quark attempted to drug Doctor Julian Bashir with, in an attempt to fix a racquetball match between Bashir and Miles O'Brien. (DS9: "Rivals")