Chemical identity
Dacarbazine EP Impurity A / Hypoxanthine 2-Aza Impuirty / Dacarbazine Related Compound B / 2-Azahypoxanthine (Free Base)
CAS 4656-86-4 · C4H3N5O
01Identity
Identifiers and names for this exact compound. Empty fields are left unassigned.
| Lazychem ID | LC-11807 |
|---|---|
| PubChem CID | 135421876 |
| Name | Dacarbazine EP Impurity A / Hypoxanthine 2-Aza Impuirty / Dacarbazine Related Compound B / 2-Azahypoxanthine (Free Base) |
| CAS RN | 4656-86-4 |
| Molecular formula | C4H3N5O |
| Molecular weight | 137.1 g/mol |
| IUPAC name | 3,7-Dihydro-4H-imidazo[4,5-d]-1,2,3-triazin-4-one |
| InChIKey | BTERLCQQBYXVIN-UHFFFAOYSA-N |
02Structure identifiers

Structure facts for this exact identity.
| Molecular formula | C4H3N5O |
|---|---|
| InChIKey | BTERLCQQBYXVIN-UHFFFAOYSA-N |
| Ring count | 2 |
| Defined stereocentres | 0 |
| Unassigned stereocentres | 0 |
| SMILES | C1=NC2=C(N1)C(=O)NN=N2 |
|---|---|
| InChI | InChI=1S/C4H3N5O/c10-4-2-3(6-1-5-2)7-9-8-4/h1H,(H2,5,6,7,8,10) |
03India 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 4656-86-4 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 4656-86-4 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
04Names and relationships
Associated parent compound
Dacarbazine; Temozolomide
View API and impurity familyOther names
- Dacarbazine EP Impurity A
- 3,7-Dihydro-4H-imidazo(4,5-d)-1,2,3-triazin-4-one
- 2-Azahypoxanthine
- 3,5-dihydroimidazo[4,5-d]triazin-4-one
- 1,5-dihydro-4H-imidazo[4,5-d]-1,2,3-triazin-4-one
05Documented 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.
06Sources
- S01PubChem compound record, CID 135421876
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.
