C20H26O2
298.4 g/mol
APIDanger
Norethindrone
CAS68-22-4EC200-681-6
Category
API
Compound Class
Steroid
Primary Use
Pharmaceutical Raw Material
Norethindrone is an active pharmaceutical ingredient used in pharmaceutical manufacturing. It can cause cancer and developmental toxicity according to regulatory labeling requirements.
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 68-22-4
Related Compounds
ReferenceSame Category
Retinol
CAS68-26-8
pharmaceutical raw material
ReferenceSame Category
Sulfadiazine
CAS68-35-9
pharmaceutical raw material
ReferenceSame Category
Cycloserine
CAS68-41-7
pharmaceutical raw material
ReferenceSame Category
(RS)-hydroxyzine
CAS68-88-2
pharmaceutical raw material
Referencesame scaffold
Levonorgestrel
CAS797-63-7
pharmaceutical raw material
Referencesame scaffold
Norgestrel
CAS6533-00-2
pharmaceutical raw material
Referencesame scaffold
(17R)-norethindrone acetate
CAS51-98-9
pharmaceutical raw material
Referencesame scaffold
Norethindrone enanthate
CAS3836-23-5
pharmaceutical raw material
Safety Reference
Danger
H312Harmful in contact with skin
H332Harmful if inhaled
H351Suspected of causing cancer
H360May damage fertility or the unborn child
Regulatory Compliance1
- California Proposition 65USRegulation
Customs Tariff Classification
The international HS code for Norethindrone (CAS 68-22-4) is 2937.23.
HS code (international, 6-digit)
2937.23
EU CN code (8-digit)
2937 23 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
(8R,9S,10R,13S,14S,17R)-17-ethynyl-17-hydroxy-13-methyl-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one
InChIKey
VIKNJXKGJWUCNN-XGXHKTLJSA-N
SMILES
C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@]2(C#C)O)CCC4=CC(=O)CC[C@H]34
Synonyms (148)
- ENT
- MELEYA
- NET
- Levonorgestrel EP Impurity U; Norethindrone; Norethisterone; Norethisterone Acetate EP Impurity A
- Norethindrone (USP)
- Norethindrone, United States Pharmacopeia (USP)
- Norethisterone [EP monograph]
- Norethisterone for system suitability, European Pharmacopoeia (EP)
- Norethisterone, British Pharmacopoeia (BP)
- Norethisterone, European Pharmacopoeia (EP)
- Norethisteronum [INN-Latin]
- Noretisterona [INN-Spanish]
- 17-Ethinyl-19-nortestosterone
- 17-Ethynyl-19-Nortestosterone
- 19-Nor-17-ethinyltestosterone
- 19-Nor-ethindrone
- 19-Norethinyltestosterone
- 19-Norethisterone
- Activella
- Affodel
- Anhydrohydroxynorprogesterone
- Anovulatorio
- Anovule
- Brevinor 21
- Brevinor 28
- Brevinor-1 21
- Brevinor-1 28
- Camila
- Camila (TN)
- Ciclovulan
- Conludaf
- Conludag
- Deblitane
- Emzahh
- Errin
- Estrinor
- Ethinylnortestosterone
- Ethynylmortestosterone
- Ethynylnortestosterone
- Gencept
- Genora
- Gestest
- Heather
- Incassia
- Jencycla
- LEVONORGESTREL IMPURITY U
- Lyleq
- Lyza
- Menzol
- Microneth
- Micronett
- Micronor
- Micronor (TN)
- Micronor hrt
- Micronovum
- Milli
- Mini-Pe
- Mini-pill
- Minovlar
- N.E.E.
- NORETHISTERONE [MART.]
- Nelova
- Nodiol
- Nor-QD
- Nora Be
- Noraethisteronum
- Noralutin
- Norcept-E
- Norcolut
- Noresthisterone
- Norethadrone
- Norethidrone
- Norethin
- Norethindrone (Standard)
- Norethisteron
- Norethisterone
- Norethisterone (JP18)
- Norethisterone CRS
- Norethisterone RS
- Norethisterone [Progestins]
- Norethisteronum
- Norethyndron
- Norethynodron
- Norethynodrone
- Noretisterona
- Noretisterone
- Norfor
- Norgestin
- Noriday
- Noriday 28
- Norluten
- Norlutin
- Norluton
- Norlyroc
- Normapause
- Norpregneninlone
- Norpregneninolone
- Norpregneninotone
- Orquidea
- Ortho 1 35
- Ortho 7 7 7
- Ortho-Novum 1 35
- Ortho-Novum 1 50
- Ortho-Novum 7 7 7
- Ovysmen 0.5 35
- Ovysmen 1 35
- Primolut-N
- Primolut-N (TN)
- Proluteasi
- Sharobel
- Synphase
- Synphasic 28
- Tri-Norinyl
- Triella
- Trinovum 21
- Utovlan
- Utovlar
- norethindrone