EINECS: 212-349-8
Molecular Formula: C₂₁H₂₈O₂ 
Synonyms: 18,19-Dinor-17a-pregn-4-en-20-yn-3-one,13-ethyl-17-hydroxy- (7CI,8CI); (-)-Norgestrel; 13-Ethyl-17-hydroxy-18,19-dinor-17a-pregn-4-en-20-yn-3-one; 13-Ethyl-17a-ethynyl-17-hydroxygon-4-en-3-one; 17a-Ethynyl-13-ethyl-19-nortestosterone; 17a-Ethynyl-13b-ethyl-3-oxo-4-estren-17b-ol; 17a-Ethynyl-18-homo-19-nortestosterone; 18-Methylnorethindrone; 19-Nortestosterone, 17-ethynyl-18-methyl-; D-(-)-Norgestrel; Dexnorgestrel; Femilis; Femilis Slim; Follistrel; Jadelle; Levonorgestrel; Lng-IUS; Microlut; Microval; Mirena; Norgestrelem; Norlevo; Norplant; Norplant 2; Postinor 2; Wy 5104; d-(17a)-17-Hydroxy-13-ethyl-18,19-dinorpregn-4-en-20-yn-3-one;
Appearance: White crystalline powder
Molecular Weight: 312.44582
Density: 1.13 g/cm3
Boiling Point: 459.1 °C at 760 mmHg
Melting Point: 206℃
Flash Point: 195.4 °C
Storage Temperature: 2-8°C
Refractive index: 1.571
Solubility: Practically insoluble in water; slightly soluble in ethanol (~750 g/l) TS and ether R
Usage: An emergency contraceptive. Levonorgestrel is safe, tolerated and effective in emergency contraception in woman