Levonorgestrel
The (−)-enantiomer of norgestrel. — ChEBI
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Identity & molecular properties
Source-linked values| CAS number | 797-63-7 | ChEBI ↗ |
| Molecular formula | C21H28O2 | ChEBI ↗ |
| Molar mass | 312.453 g/mol | ChEBI ↗ |
| Monoisotopic mass | 312.20893 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:6443 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 312.4 g/mol | PubChem ↗ |
| Exact mass | 312.208930132 Da | PubChem ↗ |
| Computed XLogP | 3.3 | PubChem ↗ |
| Topological polar surface area (Ų) | 37.3 | PubChem ↗ |
| H-bond donors | 1 | PubChem ↗ |
| H-bond acceptors | 2 | 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
Copy any identifierlevonorgestrel17alpha-ethynyl-17beta-hydroxy-18a-homoestr-4-en-3-oneWWYNJERNGUHSAO-XUDSTZEESA-N[H][C@@]12CCC3=CC(=O)CC[C@]3([H])[C@@]1([H])CC[C@@]1(CC)[C@@]2([H])CC[C@@]1(O)C#CInChI=1S/C21H28O2/c1-3-20-11-9-17-16-8-6-15(22)13-14(16)5-7-18(17)19(20)10-12-21(20,23)4-2/h2,13,16-19,23H,3,5-12H2,1H3/t16-,17+,18+,19-,20-,21-/m0/s1Names & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
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 massUses 312.453 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsCOHCalculated 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 associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
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.