C22H28O3
340.5 g/mol
APIDanger
Norethindrone acetate
CAS51-98-9EC200-132-0
Category
API
Compound Class
Steroid
Primary Use
Pharmaceutical Raw Material
Norethindrone acetate is a synthetic steroidal compound used as an active pharmaceutical ingredient. Its structure features a tetracyclic core with ester and ether functional groups, and it is characterized by a molecular weight of approximately 340.
Pharmaceutical raw material for contraceptive formulationsCompound used in hormone therapy manufacturing
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 51-98-9
Related Compounds
SimilarStructure SimilarSimilarity 0.74
Norethindrone enanthate
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ReferenceSame Category
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Albuterol sulfate
CAS51022-70-9
pharmaceutical raw material
Referencesame scaffold
Norethisterone
CAS68-22-4
pharmaceutical raw material
Referencesame scaffold
Norgestrel
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pharmaceutical raw material
Referencesame scaffold
Levonorgestrel
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pharmaceutical raw material
Safety Reference
Danger
H302Harmful if swallowed
H312Harmful in contact with skin
H332Harmful if inhaled
H350May cause cancer
H351Suspected of causing cancer
H360May damage fertility or the unborn child
H362May cause harm to breast-fed children
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects
Regulatory Compliance1
- California Proposition 65USRegulation
Customs Tariff Classification
The international HS code for Norethindrone acetate (CAS 51-98-9) 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-13-methyl-3-oxo-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-17-yl] acetate
InChIKey
IMONTRJLAWHYGT-ZCPXKWAGSA-N
SMILES
CC(=O)O[C@]1(CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4=CC(=O)CC[C@H]34)C)C#C
Synonyms (65)
- ENTA
- Norethindrone acetate (USP)
- Norethindrone acetate, United States Pharmacopeia (USP)
- Norethisterone acetate for system suitability, European Pharmacopoeia (EP)
- Norethisterone acetate, European Pharmacopoeia (EP)
- 19-Norethindrone acetate
- 19-Norethisterone acetate
- Aygestin
- Aygestin (TN)
- Gallifrey
- Gestakadin
- Milli-Anovlar
- Milligynon
- Miniphase
- Monogest
- Norethidrone Acetate
- Norethindrone 17-acetate
- Norethindrone acetate
- Norethisteron acetate
- Norethisterone 17-acetate
- Norethisterone acetate
- Norethisterone acetate (JAN)
- Norethisterone acetate CRS
- Norethisterone acetate RS
- Norethisteroni acetas
- Norethynyltestosterone
- Norethysterone acetate
- Norlutate
- Norlutin A
- Norlutin acetate
- Norlutine acetate
- Orlutate
- Ortho Micronor
- Primolut-Nor
- Progylut