N-Nitroso DesmethylDiphenhydramine
Impurity reference standard · Diphenhydramine
- CAS number
- 55855-43-1
- InChIKey
- AZLXCAYLZMGCFN-UHFFFAOYSA-N
- Molecular formula
- C16H18N2O2
- Molecular weight
- 270.33
- Exact mass
- 270.1368 Da
About N-Nitroso DesmethylDiphenhydramine
N-Nitroso DesmethylDiphenhydramine is a specified impurity of Diphenhydramine. It is registered under CAS number 55855-43-1.
The compound is characterised by its molecular formula C16H18N2O2 and a molecular weight of 270.33, with the two-dimensional structure shown above. Because it shares the Diphenhydramine scaffold, it is typically used to track process-related and degradation impurities of Diphenhydramine during method development, forced degradation and stability studies.
Computed from the structure, the compound has a monoisotopic mass of 270.1368 Da, a calculated LogP of 3.41, a topological polar surface area of 41.90 Ų. It presents 0 hydrogen-bond donors and 3 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)
- 3.41
- Topological polar surface area
- 41.90 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 3
- Rotatable bonds
- 7
- Heavy atoms
- 20
- Rings
- 2
- Elemental composition
- C 71.09% · H 6.71% · N 10.36% · O 11.84%
Frequently asked questions
Does N-Nitroso DesmethylDiphenhydramine 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 DesmethylDiphenhydramine uniquely identified?
The InChIKey AZLXCAYLZMGCFN-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 DesmethylDiphenhydramine?
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 DesmethylDiphenhydramine?
Standard packs run from milligram to gram quantities and ship from stock. Larger or custom synthesis requirements are quoted on request.
Other Diphenhydramine 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.