Chemical identity

3-alfa,5-beta-Tetrahydro Levonorgestrel

CAS 19351-16-7 · C21H32O2

01Identity

Identifiers and names for this exact compound. Empty fields are left unassigned.

Lazychem IDLC-02426
PubChem CID71752466
Name3-alfa,5-beta-Tetrahydro Levonorgestrel
CAS RN19351-16-7
Molecular formulaC21H32O2
Molecular weight316.49 g/mol
IUPAC name(3R,5R,8R,9R,10S,13S,14S,17R)-13-Ethyl-17-ethynylhexadecahydro-1H-cyclopenta[a]phenanthrene-3,17-diol
InChIKeyPTHVTSMKEGKAHY-UJCQGIJZSA-N

02Structure identifiers

2D structurePubChem CID 71752466
Two-dimensional chemical structure of 3-alfa,5-beta-Tetrahydro Levonorgestrel, CAS 19351-16-7
Two-dimensional structure for the PubChem identity linked to this record. Confirm the identifiers before analytical use.

The parsed structure contains 4 rings, includes aliphatic carbon, has 8 defined stereocentres. These statements are calculated from the published structure string.

Defined stereocentres8
Unassigned stereocentres0
Ring count4
Secondary amines0
Tertiary amines0
N-methyl amine sites0
SMILESCC[C@]12CC[C@@H]3[C@H]4CC[C@H](C[C@H]4CC[C@H]3[C@@H]1CC[C@]2(C#C)O)O
InChINot listed
Formula from structureC21H32O2
Molecular weight from structure316.49 g/mol

03Stereochemistry

The published structure contains 8 defined and 0 unassigned tetrahedral stereocentres. The exact wedge and dash depiction is shown above.

Defined centres8Structure assigned
Unassigned centres0Structure unspecified
Assignment statusFully assignedExact published identity
Tetrahedral upper bound≤ 256Before symmetry reduction

Published same-connectivity configurations

2 records

These records have the same connectivity, molecular formula and protonation layer, but a different complete InChIKey stereochemical layer. Only separately structure-linked records are shown.

Scope: The mathematical 2^n value is only an upper bound. Symmetry and other stereogenic elements can change the number of distinct stereoisomers. A hypothetical configuration is not published as a compound record without a verified structure identity.

04India status for this compound

These results apply only to this exact compound name and CAS number. Confirm the current official instruments before making a regulatory decision.

NDPS / RCSNO EXACT MATCH FOUNDCAS 19351-16-7 has no exact match in the reviewed published schedule.
SCOMETNO EXACT REVIEWED CAS MATCHCAS 19351-16-7 has no exact match in the reviewed SCOMET list.
Review date2026-08-01Recheck the current official instruments for the material, concentration, activity and date in question.

05Names and relationships

Associated parent compound

Levonorgestrel

View API and impurity family

Other names

  • 3alpha,5beta-Tetrahydronorgestrel
  • 19351-16-7
  • 3a,5b-Tetrahydro Norgestrel
  • UNII-F3XXV841P9
  • F3XXV841P9
  • (3R,5R,8R,9R,10S,13S,14S,17R)-13-ethyl-17-ethynyl-2,3,4,5,6,7,8,9,10,11,12,14,15,16-tetradecahydro-1H-cyclopenta[a]phenanthrene-3,17-diol
  • Levonorgestrel metabolite 3alpha,5beta-tetrahydronorgestrel
  • 18,19-Dinorpregn-20-yne-3,17-diol, 13-ethyl-, (3alpha,5beta,17alpha)-
  • 3
  • A,5
  • A-Tetrahydro Norgestrel
  • (3alpha,5beta,17alpha)-13-Ethyl-18,19-ninorpregn-20-yne-3,17-diol

Related records from the same parent family

06Documented history

Dated discovery, occurrence, use and issue claims are published only when a suitable primary or government source is available.

No dated history available

No verified discovery, first report, occurrence, use or issue event is currently available for this identity.

07Sources