N-methylnicotinamide is a metabolite of niacin (or nicotinamide) and is commonly found in human urine. However low levels of urinary excretion of N-methylnicotinamide indicates niacin deficiency. In patients with liver cirrhosis nicotinamide methylation is increased leading to a rise in urinary N-methylnicotinamide. N-methylnicotinamide has been found to be a microbial metabolite.

(1S,2S)-threo-Honokitriol is a natural product of Magnolia, Magnoliaceae. (1S,2S)-threo-Honokitriol can be used as a reference standard.

Cyclocephaloside II is a natural product that can be obtained from the roots of Astragalus brachypterus and Astragalus microcephalus.