Wikipedia:  

L-Histidine

(S)-4-(2-Amino-2-carboxyethyl)imidazole; 1H-Imidazole-4-alanine, (S)-; L-beta-(4-Imidazolyl)alanin; Histidine; Glyoxaline-5-alanine; S-Histidine; HISTIDINE, L-; alpha-Amino-1H-imidazole-4-propionic acid, (S)-; (L)-Histidine; L-Alanine, 3-(1H-imidazol-4-yl)-; (S)-alpha-Amino-1H-imidazole-4-propionic acid
Molecular Formula
C6 H9 N3 O2
Natural Isotopic Abundance Mass
155.1545600000
Mono-Isotopic Molecular Masses
C12N14:   155.069476549
C13N14:   161.089605576
C12N15:   158.060581228
C13N15:   164.0807102551
L-Histidine image
L-Histidine
InCHi String:
InChI=1S/C6H9N3O2/c7-5(6(10)11)1-4-2-8-3-9-4/h2-3,5H,1,7H2,(H,8,9)(H,10,11)/t5-/m0/s1

isomeric SMILES:
C1=C(NC=N1)C[C@@H](C(=O)O)N
canonical SMILES:
C1=C(NC=N1)CC(C(=O)O)N


IUPAC: IUPAC traditional: IUPAC cas: IUPAC openeye: IUPAC systematic
(2S)-2-amino-3-(3H-imidazol-4-yl)propanoic acid



PubChem Substance (SID):   85164887   149204   3435
PubChem Compound (CID):   6274
KEGG: Compound ID   C00135
CAS Registry IDs:   150-35-6   155304-24-8   35479-49-3   35558-59-9   45955-20-2   54166-13-1   7006-35-1   71-00-1
PDB Chemical Component   HIS   HIS_LFOH
Miscellaneous Databases and IDs:   CHEBI 15971   FEMA No. 3694   EINECS 200-745-3   NSC 137773   HSDB 1810

Reference data were obtained primarily from the PubChem database.

Three dimensional molecular rendering uses Jmol.