Chemical identity

Norethindrone Acetate EP Impurity B / Norethisterone Acetate EP Impurity B / Norethindrone Acetate 5,10-Dehydro Impurity

CAS 19637-28-6 · C22H28O3

01Identity

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

Lazychem IDLC-23699
PubChem CID54193985
NameNorethindrone Acetate EP Impurity B / Norethisterone Acetate EP Impurity B / Norethindrone Acetate 5,10-Dehydro Impurity
CAS RN19637-28-6
Molecular formulaC22H28O3
Molecular weight340.46 g/mol
IUPAC name3-oxo-19-nor-17α-pregn-5(10)-en-20-yn-17-yl acetate
InChIKeyPKMFOAKNKZEDBU-AANPDWTMSA-N

02Structure identifiers

2D structurePubChem CID 54193985
Two-dimensional chemical structure of Norethindrone Acetate EP Impurity B / Norethisterone Acetate EP Impurity B / Norethindrone Acetate 5,10-Dehydro Impurity, CAS 19637-28-6
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 5 defined stereocentres. These statements are calculated from the published structure string.

Defined stereocentres5
Unassigned stereocentres0
Ring count4
Secondary amines0
Tertiary amines0
N-methyl amine sites0
SMILESCC(=O)O[C@]1(CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4=C3CCC(=O)C4)C)C#C
InChINot listed
Formula from structureC22H28O3
Molecular weight from structure340.46 g/mol

03Stereochemistry

The published structure contains 5 defined and 0 unassigned tetrahedral stereocentres. The exact wedge and dash depiction is shown above.

Defined centres5Structure assigned
Unassigned centres0Structure unspecified
Assignment statusFully assignedExact published identity
Tetrahedral upper bound≤ 32Before symmetry reduction

Published same-connectivity configurations

1 record

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.

No additional structure-linked configuration with the same connectivity is currently present in the LazyChem dataset.

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 19637-28-6 has no exact match in the reviewed published schedule.
SCOMETNO EXACT REVIEWED CAS MATCHCAS 19637-28-6 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

Norethindrone Acetate; Norethisterone Acetate

View API and impurity family

Other names

  • Norethindrone Acetate EP Impurity B
  • Norethisterone Acetate EP Impurity B
  • Norethindrone Acetate 5,10-Dehydro Impurity
  • Delta-5(10)-Norethindrone Acetate
  • 19637-28-6
  • 50UR8DXV14
  • UNII-50UR8DXV14
  • [(8R,9S,13S,14S,17R)-17-Ethynyl-13-methyl-3-oxo-1,2,4,6,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-17-yl] acetate
  • (17alpha)-17-(Acetyloxy)-19-norpregn-5(10)-en-20-yn-3-one
  • 19-Norpregn-5(10)-en-20-yn-3-one, 17-(acetyloxy)-, (17alpha)-
  • DTXSID20709684
  • NORETHISTERONE ACETATE IMPURITY B [EP IMPURITY]

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