Histidine is an essential amino acid, it contains imidazole side chain. Histidine is  one of 20 standard amino acids.

Nutritional Phytochemical Analytical Laboratory

Molecular Weight: 155.15

Molecular Formula:  C₆H₉N₃O₂

IUPAC Name: 2-amino-3-(3H-imidazol-4-yl)propanoic acid

CAS Name: L-Histidine

CAS number:  71-00-1

One Letter Code: 

Three Letter Code:

Histidine

Structural Formula

3D Structural Formula