Ribonuclease A (RNase A) is a potent endonuclease that removes RNA during dna and protein preparation.

4-Ethoxybenzoic acid is a compound of luminescent bioapplication.

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.