
Chemical identity
Captopril EP Impurity D
CAS 56970-78-6 · C4H7BrO2
01Identity
Identifiers and names for this exact compound. Empty fields are left unassigned.
| Lazychem ID | LC-09352 |
|---|---|
| PubChem CID | 304776 |
| Name | Captopril EP Impurity D |
| CAS RN | 56970-78-6 |
| Molecular formula | C4H7BrO2 |
| Molecular weight | 167.00 g/mol |
| IUPAC name | (2RS)-3-bromo-2-methylpropanoic acid |
| InChIKey | BUPXDXGYFXDDAA-UHFFFAOYSA-N |
02Structure identifiers

Structure facts for this exact identity.
| Molecular formula | C4H7BrO2 |
|---|---|
| InChIKey | BUPXDXGYFXDDAA-UHFFFAOYSA-N |
| Ring count | 0 |
| Defined stereocentres | 0 |
| Unassigned stereocentres | 1 |
| SMILES | CC(CBr)C(=O)O |
|---|---|
| InChI | InChI=1S/C4H7BrO2/c1-3(2-5)4(6)7/h3H,2H2,1H3,(H,6,7) |
03Stereochemistry
The published structure contains 0 defined and 1 unassigned tetrahedral stereocentre. The exact wedge-and-dash depiction is shown above.
Published same-connectivity configurations
1 recordThese 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 / RCS | NOT FOUND IN REVIEWED ENTRIES | CAS 56970-78-6 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 56970-78-6 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
Captopril
View API and impurity familyOther names
- Captopril Bromo Acid
- 3-Bromo-2-methylpropionic acid
- Propanoic acid, 3-bromo-2-methyl-
- UNII-07304AI75I
- .BETA.-BROMOISOBUTANOIC ACID
- CAPTOPRIL IMPURITY D [EP IMPURITY]
- PROPIONIC ACID, 3-BROMO-2-METHYL-
- (2RS)-3-BROMO-2-METHYLPROPANOIC ACID
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 304776
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.
