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Record Information
Version1.0
Creation Date2014-09-11 05:16:42 UTC
Update Date2016-11-09 01:09:12 UTC
Accession NumberCHEM003747
Identification
Common NameEstriol
ClassSmall Molecule
DescriptionA hydroxylated metabolite of estradiol or estrone that has a hydroxyl group at C3-beta, 16-alpha, and 17-beta position. Estriol is a major urinary estrogen. During pregnancy, large amount of estriol is produced by the placenta. Isomers with inversion of the hydroxyl group or groups are called epiestriol. Though estriol is used as part of the primarily North American phenomenon of bioidentical hormone replacement therapy, it is not approved for use by the FDA or Health Canada. It is however available in the United States by prescription filled only by compounding pharmacies. It has also been approved and marketed throughout Europe and Asia for approximately 40 years for the treatment of post-menopausal hot flashes.
Contaminant Sources
  • FooDB Chemicals
  • HMDB Contaminants - Urine
  • STOFF IDENT Compounds
  • T3DB toxins
  • ToxCast & Tox21 Chemicals
Contaminant Type
  • Animal Toxin
  • Drug
  • Food Toxin
  • Metabolite
  • Natural Compound
  • Organic Compound
Chemical Structure
Thumb
Synonyms
ValueSource
(16alpha,17beta)-Estra-1,3,5(10)-triene-3,16,17-triolChEBI
1,3,5(10)-Estratriene-3,16-alpha,17beta-triolChEBI
16alpha,17beta-EstriolChEBI
16alpha-HydroxyestradiolChEBI
3,16alpha,17beta-Trihydroxy-Delta(1,3,5)-estratrieneChEBI
Deuslon-aChEBI
EstrielChEBI
OestriolChEBI
TrihydroxyestrinChEBI
(16a,17b)-Estra-1,3,5(10)-triene-3,16,17-triolGenerator
(16Α,17β)-estra-1,3,5(10)-triene-3,16,17-triolGenerator
1,3,5(10)-Estratriene-3,16-a,17b-triolGenerator
1,3,5(10)-Estratriene-3,16-α,17β-triolGenerator
16a,17b-EstriolGenerator
16Α,17β-estriolGenerator
16a-HydroxyestradiolGenerator
16Α-hydroxyestradiolGenerator
3,16a,17b-Trihydroxy-delta(1,3,5)-estratrieneGenerator
3,16Α,17β-trihydroxy-δ(1,3,5)-estratrieneGenerator
3,16a,17b-Trihydroxy-δ(1,3,5)-estratrieneHMDB
13b-Methyl-1,3,5(10)-gonatriene-3,16a,17b-triolHMDB
16-alpha,17-beta-EstriolHMDB
16-alpha,17-beta-OestriolHMDB
16-alpha-HydroxyestradiolHMDB
16a-EstriolHMDB
16alpha,17beta-OestriolHMDB
16alpha-Hydroxy-17beta-estradiolHMDB
16alpha-HydroxyoestradiolHMDB
3,16a,17b-EstriolHMDB
3,16a,17b-Trihydroxyestra-1,3,5(10)-trieneHMDB
3,16alpha,17beta-Trihydroxy-1,3,5(10)-estratrieneHMDB
3,16alpha,17beta-Trihydroxyestra-1,3,5(10)-trieneHMDB
AacifemineHMDB
ColpogynHMDB
ColpovisterHMDB
DestriolHMDB
Deuslon aHMDB
Estra-1,3,5(10)-triene-3,16a,17b-triolHMDB
EstratriolHMDB
Follicular hormone hydrateHMDB
GynasanHMDB
HemostyptanonHMDB
Holin VHMDB
HormomedHMDB
IncurinHMDB
Klimax eHMDB
KlimoralHMDB
OekolpHMDB
OestratriolHMDB
OestriolumHMDB
OrestinHMDB
OrgastyptinHMDB
Ortho-gynestHMDB
OvesterinHMDB
OvestinHMDB
OvestinonHMDB
OvestrionHMDB
Ovo-vincesHMDB
TheelolHMDB
TridestrinHMDB
TriovexHMDB
16-alpha-Hydroxy-estradiolHMDB
(16beta,17beta)-Estra-1,3,5(10)-triene-3,16,17-triolHMDB
16beta Hydroxy estradiolHMDB
16beta-Hydroxy-estradiolHMDB
EpiestriolHMDB
16 alpha Hydroxy estradiolHMDB
16alpha,17beta EstriolHMDB
Estra-1,3,5(10)-triene-3,16beta,17beta-triolHMDB
13beta-Methyl-1,3,5(10)-gonatriene-3,16alpha,17beta-triolHMDB
13β-Methyl-1,3,5(10)-gonatriene-3,16α,17β-triolHMDB
16alpha-EstriolHMDB
16α-EstriolHMDB
3,16alpha,17beta-EstriolHMDB
3,16α,17β-EstriolHMDB
3,16α,17β-Trihydroxyestra-1,3,5(10)-trieneHMDB
EstriolHMDB
Chemical FormulaC18H24O3
Average Molecular Mass288.381 g/mol
Monoisotopic Mass288.173 g/mol
CAS Registry Number50-27-1
IUPAC Name(1S,10R,11S,13R,14R,15S)-15-methyltetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadeca-2(7),3,5-triene-5,13,14-triol
Traditional Name(1S,10R,11S,13R,14R,15S)-15-methyltetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadeca-2(7),3,5-triene-5,13,14-triol
SMILES[H][C@@]12C[C@@H](O)[C@H](O)[C@@]1(C)CC[C@]1([H])C3=C(CC[C@@]21[H])C=C(O)C=C3
InChI IdentifierInChI=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/s1
InChI KeyPROQIPRRNZUXQM-ZXXIGWHRSA-N
Chemical Taxonomy
Description belongs to the class of organic compounds known as estrogens and derivatives. These are steroids with a structure containing a 3-hydroxylated estrane.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassSteroids and steroid derivatives
Sub ClassEstrane steroids
Direct ParentEstrogens and derivatives
Alternative Parents
Substituents
  • Estrogen-skeleton
  • 3-hydroxysteroid
  • 17-hydroxysteroid
  • 16-hydroxysteroid
  • 16-alpha-hydroxysteroid
  • Hydroxysteroid
  • Phenanthrene
  • Tetralin
  • 1-hydroxy-2-unsubstituted benzenoid
  • Benzenoid
  • Cyclic alcohol
  • Secondary alcohol
  • 1,2-diol
  • Polyol
  • Organooxygen compound
  • Hydrocarbon derivative
  • Alcohol
  • Organic oxygen compound
  • Aromatic homopolycyclic compound
Molecular FrameworkAromatic homopolycyclic compounds
External Descriptors
Biological Properties
StatusDetected and Not Quantified
OriginEndogenous
Cellular Locations
  • Cytoplasm
  • Endoplasmic reticulum
  • Extracellular
  • Membrane
Biofluid LocationsNot Available
Tissue Locations
  • Adrenal Cortex
  • Adrenal Gland
  • Kidney
  • Liver
  • Placenta
  • Testes
PathwaysNot Available
ApplicationsNot Available
Biological RolesNot Available
Chemical RolesNot Available
Physical Properties
StateSolid
AppearanceWhite powder.
Experimental Properties
PropertyValue
Melting Point82-86°C
Boiling PointNot Available
SolubilityNot Available
Predicted Properties
PropertyValueSource
Water Solubility0.12 g/LALOGPS
logP2.54ALOGPS
logP2.67ChemAxon
logS-3.4ALOGPS
pKa (Strongest Acidic)10.33ChemAxon
pKa (Strongest Basic)-3.2ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count3ChemAxon
Polar Surface Area60.69 ŲChemAxon
Rotatable Bond Count0ChemAxon
Refractivity81.27 m³·mol⁻¹ChemAxon
Polarizability33.08 ųChemAxon
Number of Rings4ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Spectrum TypeDescriptionSplash Key
GC-MSGC-MS Spectrum - GC-MS (3 TMS)splash10-005a-1983000000-2f46d0d29b48132f7670View in MoNA
Predicted GC-MSPredicted GC-MS Spectrum - GC-MSsplash10-0ab9-1390000000-492aa66975c4e026b9d8View in MoNA
GC-MSGC-MS Spectrum - EI-Bsplash10-000i-4970000000-1aa2bbf3f32fd687c37dView in MoNA
GC-MSGC-MS Spectrum - GC-MSsplash10-005a-1983000000-2f46d0d29b48132f7670View in MoNA
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (3 TMS)splash10-009i-2033900000-46c301a46b654b6c6bf3View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 10V, Positive (Annotated)splash10-0a4i-5900000000-2102cb581ac98fea87b0View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 25V, Positive (Annotated)splash10-0a4i-1900000000-1fab12be883127f80c67View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 40V, Positive (Annotated)splash10-0a4i-5900000000-2102cb581ac98fea87b0View in MoNA
LC-MS/MSLC-MS/MS Spectrum - EI-B (JEOL JMS-01-SG-2) , Positivesplash10-000i-4970000000-1aa2bbf3f32fd687c37dView in MoNA
LC-MS/MSLC-MS/MS Spectrum - Linear Ion Trap , negativesplash10-000i-0390000000-891430228022fb330b42View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-000i-0190000000-b047d204e97271aa8a65View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-00dr-0490000000-c0c0bd8b1dc1381c06faView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0ufr-3950000000-b7180dbe548021fd7fc9View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-000i-0090000000-743915792d6f69593b2bView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-000i-0090000000-8469d578b4631e8de995View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-02p0-0190000000-738399876b56d0e183d5View in MoNA
MSMass Spectrum (Electron Ionization)splash10-000i-3950000000-c2f0781bc5056d66aaf5View in MoNA
1D NMR1H NMR SpectrumNot Available
2D NMR[1H,13C] 2D NMR SpectrumNot Available
Toxicity Profile
Route of ExposureNot Available
Mechanism of ToxicityEstriol levels can be measured to give an indication of the general health of the fetus. DHEA-S is produced by the adrenal cortex of the fetus. This is converted to estriol by the placenta. If levels of "unconjugated estriol" are abnormally low in a pregnant woman, this may indicate a problem with the development of the child. The drug interacts with a target cell receptor. When the estrogen receptor has bound its ligand it can enter the nucleus of the target cell, and regulate gene transcription which leads to formation of messenger RNA. The mRNA interacts with ribosomes to produce specific proteins that express the effect of estriol upon the target cell. Estrogens increase the hepatic synthesis of sex hormone binding globulin (SHBG), thyroid-binding globulin (TBG), and other serum proteins and suppress follicle-stimulating hormone (FSH) from the anterior pituitary.
MetabolismNot Available
Toxicity ValuesORAL (LD50): Acute: >2000 mg/kg [Rat].
Lethal DoseNot Available
Carcinogenicity (IARC Classification)No indication of carcinogenicity to humans (not listed by IARC).
Uses/SourcesUsed as a test to determine the general health of an unborn fetus.
Minimum Risk LevelNot Available
Health EffectsNot Available
SymptomsNot Available
TreatmentNot Available
Concentrations
Not Available
DrugBank IDDB04573
HMDB IDHMDB0000153
FooDB IDFDB006781
Phenol Explorer IDNot Available
KNApSAcK IDNot Available
BiGG ID45207
BioCyc IDESTRIOL
METLIN ID2581
PDB IDNot Available
Wikipedia LinkEstriol
Chemspider ID5553
ChEBI ID27974
PubChem Compound ID5756
Kegg Compound IDC05141
YMDB IDNot Available
ECMDB IDNot Available
References
Synthesis Reference

James V. Freeman, Gary M. Johnson, “Synthesis of 6.alpha.-functionalized estriol haptens and protein conjugates thereof.” U.S. Patent US5902888, issued June, 1973.

MSDSLink
General References
1. Leeds, Norma S.; Fukushima, David K.; Gallagher, T. F. Studies of steroid ring D epoxides of enol acetates; a new synthesis of estriol and of androstane-3b,16a,17b-triol. Journal of the American Chemical Society (1954), 76 2943-8.
2. Wolford ST, Argoudelis CJ: Measurement of estrogens in cow's milk, human milk, and dairy products. J Dairy Sci. 1979 Sep;62(9):1458-63. doi: 10.3168/jds.S0022-0302(79)83446-3.
3. Leeds, Norma S.; Fukushima, David K.; Gallagher, T. F. Studies of steroid ring D epoxides of enol acetates; a new synthesis of estriol and of androstane-3b,16a,17b-triol. Journal of the American Chemical Society (1954), 76 2943-8.
4. Diczfalusy E: The early history of estriol. J Steroid Biochem. 1984 Apr;20(4B):945-53.
5. Kashork CD, Sutton VR, Fonda Allen JS, Schmidt DE, Likhite ML, Potocki L, O'Brien WE, Shaffer LG: Low or absent unconjugated estriol in pregnancy: an indicator for steroid sulfatase deficiency detectable by fluorescence in situ hybridization and biochemical analysis. Prenat Diagn. 2002 Nov;22(11):1028-32.
6. Furuhashi N, Tsujiei M: [Clinical significance of serum and urinary estriol analysis in endocrine tests of the gonadal and placental system]. Nihon Rinsho. 1989 Dec;48 Suppl:1260-2.
7. Ronin-Walknowska E, Szczygielski A, Skoczowska M: [Usefulness of determining free estriol, placental lactogen, progesterone, placental alkaline phosphatase, uric acid, hematocrit, hemoglobin and proteins in the blood and estrogen in the urine in the prognosis of the status of newborn infants in EPH gestosis]. Ginekol Pol. 1987 Jan;58(1):21-6.
8. Fredricsson B, Carlstrom K, Eneroth P: Short-term variations in urinary estriol and renal function. Possible effects of extraneous conditions. Gynecol Obstet Invest. 1978;9(5):268-76.
9. Andreolini F, Borra C, Caccamo F, Di Corcia A, Nicoletti I, Samperi R, Improta F: Estriol and its conjugates in late pregnancy determined by extraction with Carbopack B and liquid chromatography with fluorometric detection. Clin Chem. 1985 Oct;31(10):1698-702.
10. Truran PL, Read GF, Walker S: Radioimmunoassay for salivary estriol, with use of an 125I radioligand and a solid-phase separation technique. Clin Chem. 1982 Dec;28(12):2393-7.
11. Izumi H, Saito N, Ichiki S, Makino Y, Yukitake K, Kaneoka T: Prenatal diagnosis of congenital lipoid adrenal hyperplasia. Obstet Gynecol. 1993 May;81(5 ( Pt 2)):839-41.
12. Guedeney X, Chanez C, Grenier A, Scherrmann JM: Temperature-dependent immunoreactive assay to screen for digoxin-like immunoreactive factor(s). Clin Chem. 1991 Nov;37(11):1900-4.
13. Andreolini F, Di Corcia A, Lagana A, Samperi R, Raponi G: Preliminary isolation of urinary placental estriol before gas or liquid chromatography. Clin Chem. 1983 Dec;29(12):2076-8.
14. Evans JJ, Wilkinson AR, Aickin DR: Salivary estriol concentrations during normal pregnancies, and a comparison with plasma estriol. Clin Chem. 1984 Jan;30(1):120-1.
15. Kono H, Furuhashi N, Shinkawa O, Takahashi T, Tsujiei M, Yajima A: The maternal serum cortisol levels after onset of labor. Tohoku J Exp Med. 1987 Jun;152(2):133-7.
16. Moore ML: Biochemical markers for preterm labor and birth: what is their role in the care of pregnant women? MCN Am J Matern Child Nurs. 1999 Mar-Apr;24(2):80-6.
17. Pentikainen PJ, Pentikainen LA, Azarnoff DL, Dujovne CA: Plasma levels and excretion of estrogens in urine in chronic lever disease. Gastroenterology. 1975 Jul;69(1):20-7.
18. Nutman A, Freud E, Itzhaky D, Dolfin T, Tepper R: High maternal estriol level in pregnancy as a predictor of surgical intervention for undescended testis. Fertil Steril. 2005 Jul;84(1):249-52.
19. Pasqualini JR: Enzymes involved in the formation and transformation of steroid hormones in the fetal and placental compartments. J Steroid Biochem Mol Biol. 2005 Dec;97(5):401-15. Epub 2005 Oct 3.
20. Lardy H, Marwah A, Marwah P: C(19)-5-ene steroids in nature. Vitam Horm. 2005;71:263-99.
21. Shinawi M, Szabo S, Popek E, Wassif CA, Porter FD, Potocki L: Recognition of Smith-Lemli-Opitz syndrome (RSH) in the fetus: utility of ultrasonography and biochemical analysis in pregnancies with low maternal serum estriol. Am J Med Genet A. 2005 Sep 15;138(1):56-60.
22. Soldan SS, Alvarez Retuerto AI, Sicotte NL, Voskuhl RR: Immune modulation in multiple sclerosis patients treated with the pregnancy hormone estriol. J Immunol. 2003 Dec 1;171(11):6267-74.
23. Trimesta: http://www.syntheticbiologics.com/trimesta
24. https://www.ncbi.nlm.nih.gov/pubmed/?term=11133265
25. https://www.ncbi.nlm.nih.gov/pubmed/?term=23777262
26. https://www.ncbi.nlm.nih.gov/pubmed/?term=9373313