Desmosine

**Definition:** A rare amino acid found in elastin, formed by condensation of four molecules of lysine into a pyridinium ring.

**Tree numbers:** - D03.383.725.762.300 - D12.125.072.200

**Synonyms:** - 4-(4-Amino-4-Carboxybutyl)-1-(5-Amino-5-Carboxypentyl)-3,5-bis(3-Amino-3-Carboxypropyl)pyridinium