L-Histidine

CAS	71-00-1
Structure
Synonyms	4-(2-Amino-2-carboxyethyl)imidazole
IUPAC Name	(2S)-2-Amino-3-(1H-imidazol-5-yl)propanoic acid
Molecular Weight	155.15
Molecular Formula	C6H9N3O2
Canonical SMILES	C1=C(NC=N1)CC(C(=O)O)N
InChI	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
InChI Key	HNDVDQJCIGZPNO-YFKPBYRVSA-N
Boiling Point	278.95 °C
Melting Point	282 °C(lit.)
Flash Point	282ºC
Purity	99%
Density	1.3092 g/cm³
Refractive Index	1.731
pKa	1.8(at 25 °C)
pH	7-8.5
Solubility in Water	41.6 g/L (25 ºC)
Appearance	Solid