Estriol
A 3-hydroxy steroid that is estra-1,3,5(10)-trien-3-ol substituted by additional hydroxy groups at positions 16 and 17 (16α,17β-stereoisomer). — ChEBI
Safety documents & references
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Identity & molecular properties
Source-linked values| CAS number | 50-27-1 | ChEBI ↗ |
| Molecular formula | C18H24O3 | ChEBI ↗ |
| Molar mass | 288.387 g/mol | ChEBI ↗ |
| Monoisotopic mass | 288.17254 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:27974 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 288.4 g/mol | PubChem ↗ |
| Exact mass | 288.17254462 Da | PubChem ↗ |
| Computed XLogP | 2.5 | PubChem ↗ |
| Topological polar surface area (Ų) | 60.7 | PubChem ↗ |
| H-bond donors | 3 | PubChem ↗ |
| H-bond acceptors | 3 | PubChem ↗ |
| Rotatable bonds | 0 | 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 identifierestriolestra-1,3,5(10)-triene-3,16alpha,17beta-triolPROQIPRRNZUXQM-ZXXIGWHRSA-N[H][C@@]12CCc3cc(O)ccc3[C@@]1([H])CC[C@]1(C)[C@@H](O)[C@H](O)C[C@@]21[H]InChI=1S/C18H24O3/c1-18-7-6-13-12-5-3-11(19)8-10(12)2-4-14(13)15(18)9-16(20)17(18)21/h3,5,8,13-17,19-21H,2,4,6-7,9H2,1H3/t13-,14-,15+,16-,17+,18+/m1/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 288.387 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.