The organic compound citrulline is an α-amino acid. Its name is derived from citrullus, the Latin word for watermelon, from which it was first isolated in 1914 by Koga & Odake. It was finally identified by Wada in 1930.[2] It has the formula H2NC(O)NH(CH2)3CH(NH2)CO2H. It is a key intermediate in the urea cycle, the pathway by which mammals excrete ammonia.
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IUPAC name
2-Amino-5-(carbamoylamino)pentanoic acid[1]
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CAS Number
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627-77-0 13594-51-9 R 372-75-8 S |
3DMet | B01217 |
Beilstein Reference
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1725417, 1725415 R, 1725416 S |
ChEBI | CHEBI:18211 |
ChEMBL | ChEMBL444814 |
ChemSpider | 810 553200 R 9367 S |
DrugBank | DB00155 |
EC Number | 211-012-2 |
Gmelin Reference
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774677 S |
IUPHAR/BPS
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722 |
Jmol interactive 3D | Image Image |
KEGG | D07706 |
MeSH | Citrulline |
PubChem | 833 637599 R 9750 S |
UNII | 29VT07BGDA |
InChI[show]
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SMILES[show]
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Chemical formula
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C6H13N3O3 |
Molar mass | 175.19 g·mol−1 |
Appearance | White crystals |
Odor | Odourless |
log P | −1.373 |
Acidity (pKa) | 2.508 |
Basicity (pKb) | 11.489 |
Specific
heat capacity (C) |
232.80 J K−1 mol−1 |
Std molar
entropy (So298) |
254.4 J K−1 mol−1 |
Related alkanoic acids
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N-Acetylaspartic acid |
Related compounds
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Bromisoval |