Glutaric acid is a simple five-carbon linear dicarboxylic acid. Glutaric acid is naturally produced in the body during the metabolism of some amino acids including lysine and tryptophan. Glutaric acid may cause irritation to the skin and eyes. When present in sufficiently high levels glutaric acid can act as an acidogen and a metabotoxin.

N-a-Acetyl-L-arginine also known as N-ac-L-arg-OH or N-alpha-acetylarginine belongs to the class of organic compounds known as n-acyl-l-alpha-amino acids.

Adenosylcobalamin is a biologically active form of vitamin B12 .It is a cofactor for methylmalonyl CoA mutase.?It belongs to the corrinoid group of compounds, which contain a corrin macrocycle, and is produced only by certain bacteria and archaea.?