Ornithine

L-Ornithine
Names
	IUPAC name (2S)-2,5-diaminopentanoic acid
	Other names (+)-(S)-2,5-Diaminovaleric acid; (+)-(S)-2,5-Diaminopentanoic acid
Identifiers
CAS Number	70-26-8;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:15729;
ChEMBL	ChEMBL446143;
ChemSpider	6026;
DrugBank	DB00129;
ECHA InfoCard	100.000.665
EC Number	200-731-7;
IUPHAR/BPS	725;
KEGG	D08302;
MeSH	Ornithine
PubChem CID	389;
UNII	E524N2IXA3;
CompTox Dashboard (EPA)	DTXSID00883219 ;
	InChI InChI=1S/C5H12N2O2/c6-3-1-2-4(7)5(8)9/h4H,1-3,6-7H2,(H,8,9)/t4-/m0/s1 Key: AHLPHDHHMVZTML-BYPYZUCNSA-N; InChI=1/C5H12N2O2/c6-3-1-2-4(7)5(8)9/h4H,1-3,6-7H2,(H,8,9)/t4-/m0/s1 Key: AHLPHDHHMVZTML-BYPYZUCNSA-N;
	SMILES O=C(O)[C@@H](N)CCCN;
Properties
Chemical formula	C5H12N2O2
Molar mass	132.16 g/mol
Melting point	140 °C (284 °F; 413 K)
Solubility in water	Soluble
Solubility	Soluble in ethanol
Acidity (pKa)	1.94
Chiral rotation ([α]D)	+11.5 (H2O, c = 6.5)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Ornithine is a non-proteinogenic α-amino acid that plays a role in the urea cycle. It is not incorporated into proteins during translation. Ornithine is abnormally accumulated in the body in ornithine transcarbamylase deficiency, a disorder of the urea cycle. The moiety derived from ornithine is called ornithyl.