Chemical identity
Amitriptyline EP Impurity D
CAS 1159-03-1 · C20H25NO
01Identity
Identifiers and names for this exact compound. Empty fields are left unassigned.
| Lazychem ID | LC-06000 |
|---|---|
| PubChem CID | 14390 |
| Name | Amitriptyline EP Impurity D |
| CAS RN | 1159-03-1 |
| Molecular formula | C20H25NO |
| Molecular weight | 295.42 g/mol |
| IUPAC name | 5-[3-(Dimethylamino)propyl]-10,11-dihydro-5H-dibenzo[a,d][7]annulen-5-ol |
| InChIKey | ONSQUXZPOPTSQF-UHFFFAOYSA-N |
02Structure identifiers

Structure facts for this exact identity.
| Molecular formula | C20H25NO |
|---|---|
| InChIKey | ONSQUXZPOPTSQF-UHFFFAOYSA-N |
| Ring count | 3 |
| Defined stereocentres | 0 |
| Unassigned stereocentres | 0 |
| SMILES | OC1(CCCN(C)C)C2=CC=CC=C2CCC3=CC=CC=C13 |
|---|---|
| InChI | InChI=1S/C20H25NO/c1-21(2)15-7-14-20(22)18-10-5-3-8-16(18)12-13-17-9-4-6-11-19(17)20/h3-6,8-11,22H,7,12-15H2,1-2H3 |
03Possible N-nitroso structures
A record-level structural review indicates a possible N-nitroso candidate. This is not a confirmed impurity, formation prediction or analytical finding.
A structural result alone does not establish that a nitrosamine forms. A process-specific and analytical assessment is required.
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 / RCS | NOT FOUND IN REVIEWED ENTRIES | CAS 1159-03-1 was not found in the reviewed exact-identity entries. Generic, class, analogue, salt and isomer provisions were not evaluated. |
|---|---|---|
| SCOMET | NOT FOUND IN REVIEWED CAS ENTRIES | CAS 1159-03-1 was not found in the reviewed exact-CAS mapping. Generic and analogue entries were not evaluated. |
- Narcotic Drugs and Psychotropic Substances Act, 1985, ScheduleDepartment of Revenue, Government of India · source version 1985-09-16
- Controlled-substances notifications and amendmentsDepartment of Revenue, Government of India · source version 2026-03-11
- Appendix 3, SCOMET ListDirectorate General of Foreign Trade, Government of India · source version 2024-09-02
05Names and relationships
Associated parent compound
Amitriptyline/Nortriptyline
View API and impurity familyOther names
- 5-(3-Dimethylaminopropyl)5-dibenzo(a,d)cycloheptadienol
- 10,11-Dihydro-5-(3-dimethylaminopropyl)-5H-dibenzo(a,d)cyclohepten-5-ol
- Amitriptyline Related Compound B
06Documented history
Dated discovery, occurrence, use and issue claims are published only when a suitable primary or government source is available.
No verified discovery, first report, occurrence, use or issue event is currently available for this identity.
07Sources
- S01PubChem compound record, CID 14390
Names and machine-readable chemical identity properties.
- S02NCBI website and molecular data policies
Reuse policy for NCBI molecular data. This page does not reproduce vendor descriptions or contributed narrative text.
- S03Narcotic Drugs and Psychotropic Substances Act, 1985, Schedule
Department of Revenue, Government of India. Used for the exact-compound India status shown on this page.
- S04Controlled-substances notifications and amendments
Department of Revenue, Government of India. Used for the exact-compound India status shown on this page.
- S05Appendix 3, SCOMET List
Directorate General of Foreign Trade, Government of India. Used for the exact-compound India status shown on this page.
