C20H24O2
296.4 g/mol
APIDanger
Ethinyl estradiol
CAS57-63-6EC200-342-2
Category
API
Compound Class
Steroid
Primary Use
Pharmaceutical Raw Material
Ethinyl estradiol is a synthetic estrogenic hormone used as an active pharmaceutical ingredient. It is a key compound in the manufacturing of hormonal contraceptives and other estrogen-based pharmaceutical products.
active pharmaceutical ingredient in combination contraceptivesestrogenic hormone component in pharmaceutical 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 57-63-6
Related Compounds
SimilarStructure SimilarSimilarity 0.73
2-methyl-ethinylestradiol
CAS3240-39-9
pharmaceutical raw material
ReferenceSame Category
Physostigmine salicylate
CAS57-64-7
pharmaceutical raw material
ReferenceSame Category
Sulfamethazine
CAS57-68-1
pharmaceutical raw material
ReferenceSame Category
Progesterone
CAS57-83-0
pharmaceutical raw material
ReferenceSame Category
Testosterone propionate
CAS57-85-2
pharmaceutical raw material
Referencestereoisomer of
17β-ethinylestradiol
CAS4717-38-8
pharmaceutical raw material
Safety Reference
Danger
H302Harmful if swallowed
H350May cause cancer
H360May damage fertility or the unborn child
H372Causes damage to organs through prolonged or repeated exposure
H410Very toxic to aquatic life with long lasting effects
Regulatory Compliance1
- California Proposition 65USRegulation
Customs Tariff Classification
The international HS code for Ethinyl estradiol (CAS 57-63-6) 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,13S,14S,17R)-17-ethynyl-13-methyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthrene-3,17-diol
InChIKey
BFPYWIDHMRZLRN-SLHNCBLASA-N
SMILES
C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@]2(C#C)O)CCC4=C3C=CC(=C4)O
Synonyms (159)
- 3WF
- Ethinyl estradiol (USP)
- Ethinyl estradiol, United States Pharmacopeia (USP)
- Ethinylestradiol (JP18/INN)
- Ethinylestradiol for system suitability, European Pharmacopoeia (EP)
- Ethinylestradiol, European Pharmacopoeia (EP)
- Ethinylestradiolum [INN-Latin]
- Etinilestradiol [INN-Spanish]
- 17-Ethinyl-3,17-estradiol
- 17-Ethinyl-3,17-oestradiol
- 17-Ethinylestradiol
- 17-Ethynylestradiol
- 17-Ethynylestradiol ram
- 17-Ethynyloestradiol
- 17.alpha.-Ethynyloestradiol
- 17a-Ethinyl-17b-estradiol
- 17a-Ethinylestradiol
- 17a-Ethynyl-17b-oestradiol
- 17a-Ethynylestradiol
- 17a-Ethynylestradiol-l7b
- 17a-Ethynyloestradiol
- 17a-Ethynyloestradiol-17b
- 17alpha-Ethinylestradiol
- 17alpha-Ethynylestradiol
- 17| cent-Ethynylestradiol
- Aethinyloestradiolum
- Aethinyoestradiol
- Aethinyoestradiol [German]
- Amenoron
- Amethia
- Anovlar
- Anovlar (Salt/Mix)
- Azurette
- Camrese
- Certostat
- Chee-O-Gen
- Chee-O-Genf
- Desogen (Salt/Mix)
- Diognat-E
- Diogyn E
- Diprol
- Dyloform
- EE(sub 2)
- ETHINYLESTRADIOL [MART.]
- Ertonyl
- Esteed
- Estigyn
- Estinyl
- Estinyl (TN)
- Eston-E
- Estopherol
- Estopherol (Salt/Mix)
- Estoral
- Estoral (Orion)
- Estoral (VAN)
- Estorals
- Estradiol, 17-ethynyl-
- Estradiol, Ethinyl
- Estradiol, Ethynyl
- Ethidol
- Ethinoral
- Ethinyl E2
- Ethinyl Oestradiol Effik
- Ethinyl-oestranol
- Ethinylestradiol (Standard)
- Ethinylestradiol CRS
- Ethinylestradiol RS
- Ethinylestradiolum
- Ethinyloestradiol
- Ethynylestradiol
- Ethynyloestradiol
- Eticyclin
- Eticyclol
- Eticylol
- Etifollin;
- Etinestrol
- Etinestryl
- Etinilestradiol
- Etinilestradiolo
- Etinoestryl
- Etistradiol
- Etivex
- Feminone
- Follicoral
- Ginestrene
- Inestra
- Jenapharm, Ethinylestradiol
- Levlen (Salt/Mix)
- Linoral
- LoJaimiess
- Lynoral
- Menolyn
- Microfollin
- Neo-Estrone
- Nogest-S
- Nordette (Salt/Mix)
- Novestrol
- Oracon (Salt/Mix)
- Oradiol
- Orestralyn
- Orestrayln
- Ortho Evra (Salt/Mix)
- Ortho-Cyclen (Salt/Mix)
- Ortrel (Salt/Mix)
- Palonyl
- Perovex
- Primogyn
- Primogyn C
- Primogyn M
- Progynon C
- Progynon M
- Prosexol
- Rivelsa
- Rosyrah
- Seasonale (Salt/Mix)
- Seasonique (Salt/Mix)
- Secrovin (Salt/Mix)
- Spanestrin
- Tri-Levlen (Salt/Mix)
- Triphasil (Salt/Mix)
- Triquilar;
- Ylestol
- Ylestrol
- camrese Lo
- component of Demulen
- component of Oracon
- component of Ortrel
- component of Ovral
- ethinyl estradiol