NDR as a free ligand exists in 2 entries. Examples include: 1SQN 2W8Y

Find related ligands: Stereoisomers Similar ligands Chemical Structure Search

View summary at Ligand Expo

Chemical Component Summary

FormulaC20 H26 O2
Molecular Weight298.42
Isomeric SMILESC[C@]12CC[C@H]3[C@@H](CCC4=CC(=O)CC[C@H]34)[C@@H]1CC[C@@]2(O)C#C

Chemical Details

Formal Charge0
Atom Count48
Chiral Atom Count6
Chiral AtomsC1, C14, C2, C3, C5, C8
Bond Count51
Aromatic Bond Count0
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB00717 Different stereochemistry
DescriptionNorethisterone (INN, BAN), also known as Norethindrone (USAN), is a synthetic progestational hormone with actions similar to those of progesterone but functioning as a more potent inhibitor of ovulation. It has weak estrogenic and androgenic properties. The hormone has been used in treating amenorrhea, functional uterine bleeding, endometriosis, and for contraception.
  • (17alpha)-17-Ethynyl-17-hydroxyestra-4,8(14),9-trien-3-one
  • 17-alpha-Ethynyl-17-hydroxy-4-estren-3-one
  • 17-alpha-Ethynyl-19-norandrost-4-en-17-beta-ol-3-one
  • 17-alpha-Ethynyl-19-nortestosterone
  • 17-alpha-Ethynyl-4-estren-17-ol-3-one
SaltsNorethisterone acetate
Brand Names
  • Activella
  • Activelle
  • Activelle Ld
  • Alyacen 1/35
  • Alyacen 7/7/7
Affected OrganismHumans and other mammals
IndicationFor the treatment of secondary amenorrhea, endometriosis, and abnormal uterine bleeding due to hormonal imbalance in the absence of organic pathology, such as submucous fibroids or uterine cancer.
PharmacologyNorethindrone is a synthetic oral progestin. It is used for contraception or to treat such conditions as secondary amenorrhea, abnormal uterine bleeding, and endometriosis. As an oral contraceptive, norethindrone is available as either a single agent or in combination with an estrogen. Norethindrone acetate induces secretory changes in an estrogen-primed endometrium. On a weight basis, it is twice as potent as norethindrone.
Mechanism of actionProgestins diffuse freely into target cells and bind to the progesterone receptor. Target cells include the female reproductive tract, the mammary gland, the hypothalamus, and the pituitary. Once bound to the receptor, progestins slow the frequency of release of gonadotropin releasing hormone (GnRH) from the hypothalamus and blunt the pre-ovulatory LH surge.
Route of administration
  • Oral
  • Transdermal
  • Androstanes
  • Androstenes
  • Androstenols
  • Chemical Actions and Uses
  • Contraceptive Agents
  • G03FB05
  • G03AC01
  • G03AA05
  • G03FA01
  • G03AB04
CAS number68-22-4

Drug Targets

NameSequence SearchPharmacological ActionActions
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