Norgestrel

Norgestrel
Clinical data

Top, levonorgestrel (CAS 797-63-7 ); Bottom: dextronorgestrel (CAS 797-64-8 ).
AHFS/Drugs.com	Micromedex Detailed Consumer Information
MedlinePlus	a602008
ATC code	G03AA06 (WHO) G03FA10 (WHO) G03FB01 (WHO) (only combinations with estrogens)
Legal status
Legal status	US: ℞-only
Pharmacokinetic data
Biological half-life	5–14 hours
Identifiers
IUPAC name (17α)-dl-13-Ethyl-17-hydroxy-18,19-dinorpregn-4-en-20-yn-3-one
CAS Number	6533-00-2^Y
PubChem CID	16051930
ChemSpider	10481953^Y
UNII	3J8Q1747Z2
KEGG	D00954^Y
ChEBI	CHEBI:7630^N
ECHA InfoCard	100.026.758
Chemical and physical data
Formula	C₂₁H₂₈O₂
Molar mass	312.45 g·mol⁻¹
3D model (Jmol)	Interactive image
SMILES O=C\1CC[C@H]4C(=C/1)/CC[C@@H]3[C@@H]4CC[C@@]2(CC)[C@H]3CCC2(O)C#C
InChI InChI=1S/C21H28O2/c1-3-20-11-9-17-16-8-6-15(22)13-14(16)5-7-18(17)19(20)10-12-21(20,23)4-2/h2,13,16-19,23H,3,5-12H2,1H3/t16-,17+,18+,19-,20-,21?/m0/s1^Y Key:WWYNJERNGUHSAO-CULCCENASA-N^Y
^NY (what is this?)

Norgestrel (INN, USAN, BAN, JAN; brand names Logynon, Nordette, Eugynon, Microgynon, Ovran, Ovranette, Trinordiol, and numerous others) is a steroidal progestin that has been used in hormonal contraceptives. It is a mixture of two stereoisomers, dextronorgestrel and levonorgestrel. Only levonorgestrel is biologically active. Therefore, while some medications may contain dextronorgestrel, they are often labeled in terms of their levonorgestrel content only, ignoring the inert isomer.

Norgestrel has also been used as an emergency contraceptive in the Yuzpe regimen.

...
Wikipedia