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Periodic Table/Compounds/L-ornithine

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© Melvin Olsson 2025–2026
Data: IAEA & PubChem

L-ornithine

C₅H₁₂N₂O₂·132.160 g/mol·CID 6262

IUPAC: (2S)-2,5-diaminopentanoic acid

Also known as: ornithine, 70-26-8, (S)-2,5-Diaminopentanoic acid, (S)-2,5-diaminovaleric acid, (S)-Ornithine (+14 more)

2D structure of L-ornithine

Molecular Structure

Molecular Propertiesmass · H-bonds · stereo

Molecular Weight

132.160g/mol

Exact Mass

132.089878Da

Monoisotopic Mass

132.089878Da

XLogP

-4.4

Polar Surface Area

89.3Ų

Complexity

95

Formal Charge

0

H-Bond Donors

3

H-Bond Acceptors

4

Rotatable Bonds

4

Heavy Atoms

9

Stereo Centers

1

Bond Stereo

0

Drug-Likeness (Lipinski's Rule of Five)

✓ 132.2 g/mol
MW ≤ 500
✓ -4.4
LogP ≤ 5
✓ 3
H-bond donors ≤ 5
✓ 4
H-bond acceptors ≤ 10

Passes all rules — good oral bioavailability predicted

Chemical IdentifiersSMILES · InChI

InChI

InChI=1S/C5H12N2O2/c6-3-1-2-4(7)5(8)9/h4H,1-3,6-7H2,(H,8,9)/t4-/m0/s1

Isomers8 compounds with formula C₅H₁₂N₂O₂

2D structure of (2R)-2,5-diaminopentanoic acid

(2R)-2,5-diaminopentanoic acid

CID 71082 · 132.2 g/mol

2D structure of 2,5-diaminopentanoic acid

2,5-diaminopentanoic acid

CID 389 · 132.2 g/mol

2D structure of (2S)-2,5-diaminopentanoate;hydron

(2S)-2,5-diaminopentanoate;hydron

CID 88747248 · 132.2 g/mol

2D structure of tert-butyl N-aminocarbamate

tert-butyl N-aminocarbamate

CID 70091 · 132.2 g/mol

2D structure of 3-(2-hydroxyethylamino)propanamide

3-(2-hydroxyethylamino)propanamide

CID 117919 · 132.2 g/mol

2D structure of N-ethyl-N-(1-methoxyethyl)nitrous amide

N-ethyl-N-(1-methoxyethyl)nitrous amide

CID 43774 · 132.2 g/mol

2D structure of 2-hydrazinyl-3-methylbutanoic acid

2-hydrazinyl-3-methylbutanoic acid

CID 29841 · 132.2 g/mol

2D structure of 5-hydroxypentanehydrazide

5-hydroxypentanehydrazide

CID 225567 · 132.2 g/mol

External Resources

PubChem ↗Wikipedia ↗