Chemical Component Summary

FormulaC18 H24 O2
Molecular Weight272.38
Isomeric SMILESC[C@]12CC[C@H]3[C@@H](CCc4cc(O)ccc34)[C@@H]1CC[C@@H]2O

Chemical Details

Formal Charge0
Atom Count44
Chiral Atom Count5
Chiral AtomsC13, C14, C17, C8, C9
Bond Count47
Aromatic Bond Count6
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB00783 Different stereochemistry
  • approved
  • investigational
  • vet_approved
DescriptionGenerally refers to the 17-beta-isomer of estradiol, an aromatized C18 steroid with hydroxyl group at 3-beta- and 17-beta-position. Estradiol-17-beta is the most potent form of mammalian estrogenic steroids. In humans, it is produced primarily by the cyclic ovaries and the placenta. It is also produced by the adipose tissue of men and postmenopausal women. The 17-alpha-isomer of estradiol binds weakly to estrogen receptors (receptors, estrogen) and exhibits little estrogenic activity in estrogen-responsive tissues. Various isomers can be synthesized. [PubChem]
  • (17beta)-Estra-1,3,5(10)-triene-3,17-diol
  • 17beta Oestradiol
  • 17beta-Estra-1,3,5(10)-triene-3,17-diol
  • 17beta-Oestradiol
  • Benzhormovarine
  • Estradiol acetate
  • Estradiol benzoate
  • Estradiol cypionate
  • Estradiol hemihydrate
  • Estradiol valerate
Brand Names
  • Activella
  • Activelle
  • Activelle Ld
  • Alora
  • Amabelz
Affected OrganismHumans and other mammals
IndicationFor the treatment of urogenital symptoms associated with post-menopausal atrophy of the vagina (such as dryness, burning, pruritus and dyspareunia) and/or the lower urinary tract (urinary urgency and dysuria).
PharmacologyEstradiol, the principal intracellular human estrogen, is substantially more active than its metabolites, estrone and estriol, at the cellular level.
Mechanism of actionEstradiol enters target cells freely (e.g., female organs, breasts, hypothalamus, pituitary) and 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 estradiol 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.
Route of administration
  • Intramuscular
  • Oral
  • Oral; Transdermal
  • Topical
  • Transdermal
  • BCRP/ABCG2 Inhibitors
  • Chemical Actions and Uses
  • Contraceptive Agents
  • Contraceptive Agents, Female
  • Cytochrome P-450 CYP1A2 Inhibitors
  • G03FA16
  • G03FA11
  • G03FA12
  • G03FB12
  • G03FA17
CAS number50-28-2
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682