C18H20O2
268.3 g/mol
OtherDanger
Diethylstilbestrol
CAS56-53-1EC200-278-5
Category
Other
Compound Class
n.a
Primary Use
Pharmaceutical intermediate for estrogenic hormone research
Diethylstilbestrol is a synthetic nonsteroidal estrogen that was historically used in medicine. It is a compound with two aromatic rings and hydroxyl groups, contributing to its estrogenic activity.
Research compound for estrogenic activity studiesPharmaceutical intermediate 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 56-53-1
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research compound
ReferenceSame Category
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Research compound
ReferenceSame Category
Tibolone
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pharmaceutical raw material for menopausal hormone therapy
ReferenceSame Category
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pharmaceutical intermediate
Referencestereoisomer of
Trans-Diethyl-1,1,1',1'-stilbestrol-3,3',5,5'-d8
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research compound
Referencesame scaffold
(E)-1-bromo-4-(4-chlorostyryl)benzene
CAS51665-23-7
research compound
Referencesame scaffold
Pterostilbene
CAS537-42-8
pharmaceutical raw material
Safety Reference
Danger
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
H350May cause cancer
H360May damage fertility or the unborn child
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects
H411Toxic to aquatic life with long lasting effects
H341Suspected of causing genetic defects
H371May cause damage to organs
H372Causes damage to organs through prolonged or repeated exposure
H373May cause damage to organs through prolonged or repeated exposure
Regulatory Compliance1
- California Proposition 65USRegulation
Customs Tariff Classification
The international HS code for Diethylstilbestrol (CAS 56-53-1) is 2907.29.
HS code (international, 6-digit)
2907.29
EU CN code (8-digit)
2907 29 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
4-[(E)-4-(4-hydroxyphenyl)hex-3-en-3-yl]phenol
InChIKey
RGLYKWWBQGJZGM-ISLYRVAYSA-N
SMILES
CC/C(=C(/CC)\C1=CC=C(C=C1)O)/C2=CC=C(C=C2)O
Synonyms (152)
- DES
- STIL
- Diethylstilbestrol (USP/INN)
- Diethylstilbestrol, European Pharmacopoeia (EP)
- Diethylstilbestrol, United States Pharmacopeia (USP)
- Diethylstilbestrolum [INN-Latin]
- Dietilestilbestrol [INN-Spanish]
- (E)-Diethylstilbestrol
- (E,Z)-Diethylstilbestrol
- 3erd
- 4, .alpha.,.alpha.-diethyl-
- 4, 2,2'-diethyl-
- 4,4'-Dihydroxydiethylstilbene
- Acnestrol
- Agostilben
- Antigestil
- Apstil
- Bertrol
- Bio-des
- Boestrol
- Bufon
- Climaterine
- Comestrol
- Comestrol estrobene
- Cyren
- Cyren A
- DES (synthetic estrogen)
- DIETHYLSTILBESTROL [MART.]
- Dawe's destrol
- Desma
- Destrol
- Di-Estryl
- DiBestrol 2 Premix
- Diaethylstilboestrolum
- Diastyl
- Dibestrol
- Dicorvin
- Diethylstilbenediol
- Diethylstilbestrol (Standard)
- Diethylstilbestrolum
- Diethylstilboesterol
- Dietilestilbestrol
- Dietilestilbestrol [Spanish]
- Dietilstilbestrolo
- Distilbene
- Domestrol
- Dyestrol
- E-Stilbestrol
- Estilbin MCO
- Estril
- Estrobene
- Estrogen, Stilbene
- Estromenin
- Estrosyn
- Fonatol
- Grafestrol
- Gynopharm
- Hi-Bestrol
- Idroestril
- Iscovesco
- Makarol
- Menostilbeen
- Micrest
- Microest
- Milestrol
- Neo-Oestranol I
- Neo-Oestronol I
- New-Estranol 1
- Oestrogenine
- Oestrol vetag
- Oestromenin
- Oestromensil
- Oestromensyl
- Oestromienin
- Oestromon
- Pabestrol
- Palestrol
- Protectona
- Rumestrol 1
- Rumestrol 2
- Sedestran
- Serral
- Sexocretin
- Sibol
- Sintestrol
- Stibilium
- Stil-Rol
- Stilbene Estrogen
- Stilbestro
- Stilbestrol (TN)
- Stilbestrol, diethyl-
- Stilbestrone
- Stilbetin
- Stilboefral
- Stilboesterol
- Stilboestroform
- Stilboestrol
- Stilbofolin
- Stilbol
- Stilkap
- Synestrin
- Synthestrin
- Synthoestrin
- Synthofolin
- Syntofolin
- TRANS-DIETHYSTILBESTEROL
- Tampovagan
- Tampovagan stilboestrol
- Tylosterone
- Vagestrol
- cis-Des
- cis-Diethyl Stilbestrol
- cis-Diethylstilbesterol
- diethylstilbestrol
- diethylstilbestrol (DES)
- diethylstilboestrol
- neo-Oestranol 1
- strobene
- trans-.alpha.,4'-stilbenediol
- trans-Diethylstilbesterol
- trans-Diethylstilbestrol
- trans-Diethylstilboesterol