1. APIs
  2. Norethindrone
  3. Impurities

Norethindrone Impurities

Name Structure CASRN Other Names and Identifiers
6α-Hydroxynorethisterone structure
Norethindrone Dimer structure
  • Impurity 4 (Gorog 1987)
17α-Ethynyl-17-hydroxy-4-oestrene-3,6-dione structure
  • Impurity 1 (Gorog 1987)
6β-Hydroxynorethisterone structure
  • BP Norethisterone Impurity H
  • 6β,17-dihydroxy-19-nor-17α-pregn-4-en-20-yn-3-one
17-Epi-Norethisterone structure
  • BP Norethisterone Impurity G
  • 17-hydroxy-19-norpregn-4-en-20-yn-3-one
  • Impurity 3 (Gorog 1987)
3-Ethoxy-10-nor-17α-pregna-3,5-dien-20-yn-17-ol structure
  • BP Norethisterone Impurity F
3-Ethynyl-10-nor-17α-pregna-3,5-dien-20-yn-17-ol structure
  • BP Norethisterone Impurity E
17-Hydroxy-19-nor-17α-pregn-5(10)-en-20-yn-3-one structure
  • BP Norethisterone Impurity D
17-Hydroxy-19-nor-17α-pregna-5-en-20-yn-3-one structure
  • BP Norethisterone Impurity C
Norandrostenedione structure
  • BP Norethisterone Impurity B
  • BP Norethisterone Acetate Impurity J
  • estra-4-ene-3,17-dione
  • 4-oestrene-3,17-dione
  • Impurity 2 (Gorog 1987)
17-Hydroxy-19-nor-17α-pregn-4,6-dien-20-yn-3-one structure
  • BP Norethisterone Impurity A