N-Nitroso Azelastine EP Impurity A
Impurity reference standard · Azelastine
- CAS number
- —
- InChIKey
- CZFWHYGFJYRVMP-UHFFFAOYSA-N
- Molecular formula
- C7H7N3O2
- Molecular weight
- 165.15
- Exact mass
- 165.0538 Da
About N-Nitroso Azelastine EP Impurity A
N-Nitroso Azelastine EP Impurity A is a specified impurity of Azelastine. It has no single publicly registered CAS number, so it is defined by the structure and molecular formula below.
The compound is characterised by its molecular formula C7H7N3O2 and a molecular weight of 165.15, with the two-dimensional structure shown above. Because it shares the Azelastine scaffold, it is typically used to track process-related and degradation impurities of Azelastine during method development, forced degradation and stability studies.
Computed from the structure, the compound has a monoisotopic mass of 165.0538 Da, a calculated LogP of 0.68, a topological polar surface area of 75.76 Ų. It presents 1 hydrogen-bond donor and 4 acceptors. These values are commonly used to anticipate chromatographic retention and to plan ionisation conditions during method development.
Each pack ships with a certificate of analysis together with the supporting analytical data — HNMR, MS and HPLC or GC traces — so the material can be released straight into your own QC workflow.
Available from stock in milligram to gram quantities; larger or custom synthesis requirements are quoted on request.
Calculated properties
Derived from the two-dimensional structure above using RDKit. Computed values describe the parent structure and are provided as a reference for method development — they are not measured data.
- LogP (Crippen)
- 0.68
- Topological polar surface area
- 75.76 Ų
- Hydrogen bond donors
- 1
- Hydrogen bond acceptors
- 4
- Rotatable bonds
- 2
- Heavy atoms
- 12
- Rings
- 1
- Elemental composition
- C 50.91% · H 4.27% · N 25.44% · O 19.37%
Frequently asked questions
Does N-Nitroso Azelastine EP Impurity A come with a certificate of analysis?
Yes. Every pack ships with a certificate of analysis plus the supporting analytical data — HNMR, MS and HPLC or GC traces.
How is N-Nitroso Azelastine EP Impurity A uniquely identified?
The InChIKey CZFWHYGFJYRVMP-UHFFFAOYSA-N identifies the structure unambiguously, so it can be matched against your own registry or a public database.
Is a structure file available for N-Nitroso Azelastine EP Impurity A?
Yes. The two-dimensional structure is drawn on this page from the SMILES record, and the SMILES or a molfile can be supplied on request.
What pack sizes are available for N-Nitroso Azelastine EP Impurity A?
Standard packs run from milligram to gram quantities and ship from stock. Larger or custom synthesis requirements are quoted on request.
Other Azelastine impurities
The same parent compound, neighbouring impurity numbers.
Need this standard, or a related one?
Send the compound name, CAS number or a structure file — we confirm availability, pack size and lead time, usually within one business day.