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Chemical substance record

L-ascorbic acid

50-81-7C₆H₈O₆176.124 g/mol

Organic/Inorganic Small MoleculeChEBI source record

The L-enantiomer of ascorbic acid and conjugate acid of L-ascorbate. — ChEBI

Safety references

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Identity & molecular properties

Source-linked values

CAS number	50-81-7	ChEBI ↗
Molecular formula	C₆H₈O₆	ChEBI ↗
Molar mass	176.124 g/mol	ChEBI ↗
Monoisotopic mass	176.03209 Da	ChEBI ↗
Formal charge	0	ChEBI ↗
ChEBI identifier	CHEBI:29073	ChEBI ↗

Cross-source molecular data

PubChem

Molar mass	176.12 g/mol	PubChem ↗
Exact mass	176.03208797 Da	PubChem ↗
Computed XLogP	-1.6	PubChem ↗
Topological polar surface area (Å²)	107	PubChem ↗
H-bond donors	4	PubChem ↗
H-bond acceptors	6	PubChem ↗
Rotatable bonds	2	PubChem ↗

PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.

Names & structural identifiers

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Source preferred name

L-ascorbic acid

IUPAC name

(5R)-5-[(1S)-1,2-dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one

InChIKey

CIWBSHSKHKDKBQ-JLAZNSOCSA-N

SMILES

[H][C@]1([C@@H](O)CO)OC(=O)C(O)=C1O

InChI

InChI=1S/C6H8O6/c7-1-2(8)5-3(9)4(10)6(11)12-5/h2,5,7-10H,1H2/t2-,5+/m0/s1

Names & synonyms

(5R)-5-[(1S)-1,2-dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-oneacide ascorbiqueacido ascorbicoacidum ascorbicumAscoltinascorbic acidL-threo-hex-2-enono-1,4-lactone

Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.

Classification & relationships

ChEBI ontology

vitamin CChEBI parent class · 176783 ↗ascorbic acidChEBI parent class · 22652 ↗

carboxylic acid ester carbohydrate organic heterocyclic compound organic molecular entity

Roles recorded in ChEBI

geroprotectorcoenzymecofactorflour treatment agentplant metabolitefood antioxidantfood colour retention agentskin lightening agent

Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.

Mass ↔ amount of substance

Calculated from sourced mass

Amount

Input unit

Equivalent amount

0.00567782 mol

Uses 176.124 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.

Elemental composition

Theoretical mass fractions

O

Oxygen · 6 atoms

54.50%

C

Carbon · 6 atoms

40.92%

H

Hydrogen · 8 atoms

4.58%

Calculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.

Research & patent references

Selected source associations

Vitamin C and myocardial infarction: the heart of the matter. ↗The American journal of clinical nutrition · 2000 May · PMID 10799361

Role of ascorbic acid in stratum corneum lipid models exposed to UV irradiation. ↗Pharmaceutical research · 2002 Jul · PMID 12180551

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Sources & record history

Checked 27 Sep 2026

Identity, formula, mass, synonyms & ontologyEMBL-EBI ChEBI · CHEBI:29073

Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0

Additional molecular descriptorsNCBI PubChem · CID 54670067 · retrieved 2026-09-27

PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.

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