C21H28O2
312.4 g/mol
APIDanger
Levonorgestrel
CAS797-63-7EC212-349-8
Category
API
Compound Class
Steroid
Primary Use
Pharmaceutical Raw Material
Levonorgestrel is a synthetic progestin used as the active ingredient in progestin-only contraceptive products. According to government labeling requirements, levonorgestrel implants can cause female reproductive toxicity.
Active ingredient in progestin-only contraceptive pillsActive ingredient in subdermal contraceptive implantsComponent in combined oral contraceptive regimens with ethinylestradiol
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 797-63-7
Related Compounds
StrongSame Parent
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SimilarStructure SimilarSimilarity 0.75
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Safety Reference
Danger
H302Harmful if swallowed
H312Harmful in contact with skin
H332Harmful if inhaled
H351Suspected of causing cancer
H360May damage fertility or the unborn child
H362May cause harm to breast-fed children
H315Causes skin irritation
H319Causes serious eye irritation
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 Levonorgestrel (CAS 797-63-7) 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)-13-ethyl-17-ethynyl-17-hydroxy-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one
InChIKey
WWYNJERNGUHSAO-XUDSTZEESA-N
SMILES
CC[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@]2(C#C)O)CCC4=CC(=O)CC[C@H]34
Synonyms (172)
- LNG
- LNG-IUS
- Levonorgestrel (JAN/USP/INN)
- Levonorgestrel for system suitability 2, European Pharmacopoeia (EP)
- Levonorgestrel, British Pharmacopoeia (BP)
- Levonorgestrel, European Pharmacopoeia (EP)
- Levonorgestrel, United States Pharmacopeia (USP)
- Levonorgestrel; Norgestimate EP Impurity B
- Levonorgestrelum [INN-Latin]
- Norgestrel (JP17/USP/INN)
- Norgestrelum [INN-Latin]
- (-)-Norgestrel
- 18-Methylnorethisterone
- 1lhv
- After Banger
- AfterPlan
- Aftera
- Afterpill
- Athentia Next
- BAY 86-5028
- CRYSELLE COMPONENT NORGESTREL
- Curae
- D-Norgestrel
- Dexnorgestrel (obsol.);
- E-Gen-C
- EContra One-Step
- Econ Morning After
- Emergency Contraceptive
- Emerres
- Emerres una
- Empowered Choice
- Ezinelle
- FH 122-A
- Fallback Solo
- Fem Choice morning after
- Follistrel
- Her Style
- IMPLANT WITH LEVONORGESTREL
- ITHAPPENZ MORNING AFTER
- Intrauterine levonorgestrel
- Isteranda
- Jadelle
- Jaydess
- Julie
- Kyleena
- L-Norgestrel
- LD norgestrel [French]
- LEVONORGESTREL [MART.]
- Levlen ED
- Levogel
- Levonelle
- Levonelle one step
- Levonorgestrel
- Levonorgestrel (Levonelle)
- Levonorgestrel (Standard)
- Levonorgestrel 1.5 mg
- Levonorgestrel CRS
- Levonorgestrel RS
- Levonorgestrel Tablet, 1.5 mg
- Levonorgestrel implant
- Levonorgestrel implants
- Levonorgestrelum
- Levonova
- Levosert
- Liletta
- Logynon ED
- Microgest ED
- Microgyn
- Microgynon 21
- Microgynon 28
- Microgynon 30 ED
- Microgynon CD
- Microlut
- Microlution
- Microluton
- Microval
- Minivlar 30
- Mirena
- Mirena (TN)
- Monofeme 28
- Monovar
- Morning After
- My Choice TM
- My Way
- NORGESTIMATE IMPURITY B
- NORGESTREL [MART.]
- Neogest
- Neogynon 21
- New Day
- Next Choice One Dose
- Next choice
- NorLevo
- Nordet
- Nordette 21
- Nordette 28
- Norgeston
- Norgestrel (-)-form
- Norgestrel CRS
- Norgestrel [Progestins]
- Norgestrel-(-)-D
- Norgestrelum
- Norplant (TN)
- Norplant 2
- Norplant II
- Norplant System
- OVRAL COMPONENT NORGESTREL
- Opcicon One-step
- Option 2
- Optionelle
- Oral levonorgestrel
- Ovoplex 30-150
- Ovral-Lo
- Ovranette
- Ovrette
- Ovrette (TN)
- Plan B
- Plan B One-Step
- PostDay One-Step
- Postinor
- Preven
- React
- Rigevidon 21+7
- SheWise
- Skyla
- Skyla (TN)
- Stediril 30
- Stix Restart
- Take Action
- Tri-Levlen 21
- Triagynon
- Triciclor
- Trifeme 28
- Trigoa
- Trinordiol 21
- Trinordiol 28
- Triphasil 21
- Triphasil 28
- Triquilar ED
- Upostelle
- Wy 3707
- basic care levonorgestrel
- dl-Norgestrel