IUPAC Name: (8S,9S,10R,13S,14S,17R)-13-Ethyl-17-ethynyl-17-hydroxy-11-methylidene-2,6,7,8,9,10,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one 
Empirical Formula: C₂₂H₂₈O₂
Molecular Weight: 324.4565
EINECS: 258-936-2
Product Categories: Various Metabolites and Impurities; Intermediates & Fine Chemicals; Metabolites & Impurities; Pharmaceuticals; Steroids 
Index of Refraction: 1.574
Molar Refractivity: 94.35 cm³
Molar Volume: 285.6 cm³
Surface Tension: 47.1 dyne/cm
Density: 1.13 g/cm³
Flash Point: 201.1 °C
Enthalpy of Vaporization: 84.87 kJ/mol
Boiling Point: 473.1 °C at 760 mmHg
Vapour Pressure: 6.13E-11 mmHg at 25 °C 
Appearance: White Solid
Melting Point: 182-184 °C
Classification Code of Etonogestrel (CAS NO.54048-10-1): Contraceptive Agents; Contraceptive Agents, Female; Hormone; Human Data; Progestin; Reproductive Control Agents; Reproductive Effect

 Etonogestrel is a molecule used in hormonal contraceptives, most notably the subdermal implant Implanon and the contraceptive vaginal ring NuvaRing. Etonogestrel, the specific progestin used in NuvaRing, is the active metabolite of the inactive prodrug desogestrel, one of two third-generation progestins found in some epidemiological studies of combined oral contraceptive pills to be associated with a higher risk of venous thrombosis than combined oral contraceptive pills containing certain second-generation progestins.

  Etonogestrel (CAS NO.54048-10-1), its Synonyms are (17-alpha)-13-Ethyl-17-hydroxy-11-methylene-18,19-dinorpregn-4-en-20-yn-3-one ; 13-Ethyl-11-methylene-18,19-dinor-17-alpha-pregn-4-en-20-yn-3-one ; 13-Ethyl-17-hydroxy-11-methylene-18,19-dinor-17alpha-pregn-4-en-20-yn-3-one ; 17-Ethinyl-17-beta-hydroxy-18-methyl-11-methylene-4-estren-3-one ; 3-Keto-desogestrel ; 3-Ketodesogestrel ; 3-Oxodesogestrel ; Implanon .