Difelikefalin Impurity 3 CAS 956977-18-7
| CAS No. | 956977-18-7 |
| Molecular Formula | C21H31N3O4 |
| Molecular Weight | 389.49 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Structurally, Difelikefalin Impurity 3 (C21H31N3O4) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 8.0, corresponding to approximately 8 ring(s) or double-bond equivalent(s). With a molecular weight of 389.49 g/mol, it falls into the moderately-high-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
CATO supplies Difelikefalin Impurity 3 (CAS 956977-18-7), a pharmacopoeial impurity reference standard (molecular formula C21H31N3O4, MW 389.49 g/mol) used for the identification and quantification of trace impurities in APIs.
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C21H31N3O4 |
| Molecular Weight | 389.49 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Nitrogen Atoms | 3 |
Related Difelikefalin Standards
- Difelikefalin Impurity 2 (CAS 1281870-46-9)
- Difelikefalin Impurity 4 (CAS 1173664-52-2)
- Difelikefalin Impurity 29 (CAS CATO-C4X-304129)
- Difelikefalin Impurity 1 (CAS 956242-62-9)
- Difelikefalin Impurity 95 (CAS CATO-C4X-304195)
- Difelikefalin Impurity 7 (CAS 956233-15-1)
- Difelikefalin Impurity 91 (CAS CATO-C4X-304191)
- Difelikefalin Impurity 44 (CAS 957006-52-9)
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Why CATO?
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