Chemical identity

Tadalafil EP Impurity E/ Tadalafil Hydroxypiperidone

CAS 1978322-99-4 · C22H19N3O6

01Identity

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

Lazychem IDLC-28740
PubChem CID163744760
NameTadalafil EP Impurity E/ Tadalafil Hydroxypiperidone
CAS RN1978322-99-4
Molecular formulaC22H19N3O6
Molecular weight421.40 g/mol
IUPAC name(6R,12aR,12bR)-6-(1,3-benzodioxol-5-yl)-6a-hydroxy-2- methyl-2,3,6a,7,12a,12b-hexahydropyrazino[1′,2′:1,5]- pyrrolo[3,4-b]quinoline-1,4,12(6H)-trione
InChIKeyLKWAXSOKGBBZRU-UZGQDQSDSA-N

02Structure identifiers

2D structurePubChem CID 163744760
Two-dimensional chemical structure of Tadalafil EP Impurity E/ Tadalafil Hydroxypiperidone, CAS 1978322-99-4
Two-dimensional structure for the PubChem identity linked to this record. Confirm the identifiers before analytical use.

The parsed structure contains 6 rings, includes aromatic atoms, includes aliphatic carbon, has 2 defined stereocentres. These statements are calculated from the published structure string.

Defined stereocentres2
Unassigned stereocentres2
Ring count6
Secondary amines1
Tertiary amines0
N-methyl amine sites0
SMILESCN1CC(=O)N2[C@@H](C1=O)C3C(=O)C4=CC=CC=C4NC3([C@H]2C5=CC6=C(C=C5)OCO6)O
InChINot listed
Formula from structureC22H19N3O6
Molecular weight from structure421.40 g/mol

03Stereochemistry

The published structure contains 2 defined and 2 unassigned tetrahedral stereocentres. The exact wedge and dash depiction is shown above.

Defined centres2Structure assigned
Unassigned centres2Structure unspecified
Assignment statusPartially assignedExact published identity
Tetrahedral upper bound≤ 16Before 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.

04Possible N-nitroso structures

Shown for structural screening only. These candidates are not confirmed impurities, formation predictions or analytical findings.

Matched amine site1 candidate
Chemical structure of Tadalafil EP Impurity E/ Tadalafil Hydroxypiperidone with the matched amine site highlighted in amber
Amber identifies the screened atom and adjacent bonds.
Possible structure candidateUnverified identity
First calculated possible N-nitroso structure derived from Tadalafil EP Impurity E/ Tadalafil Hydroxypiperidone, with the new N-nitroso group highlighted in amber
The new N-N=O atoms and bonds are highlighted. No CAS number or compound name is assigned by this calculation.
Candidate 1Possible N-nitroso structural candidate
Calculated formula
C22H18N4O7
Candidate SMILES
CN1CC(=O)N2[C@@H](C1=O)C1C(=O)c3ccccc3N(N=O)C1(O)[C@H]2c1ccc2c(c1)OCO2

Interpretation: A structural alert alone does not establish that a nitrosamine forms. Evaluate nitrite sources, amine reagents, pH, temperature, process sequence, purge and analytical evidence.

05India 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 1978322-99-4 has no exact match in the reviewed published schedule.
SCOMETNO EXACT REVIEWED CAS MATCHCAS 1978322-99-4 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.

06Names and relationships

Associated parent compound

Tadalafil

View API and impurity family

Other names

  • Tadalafil EP Impurity E
  • Tadalafil Hydroxypiperidone

Related records from the same parent family

07Documented 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.

08Sources