Tizanidine impurity 21 CAS CATO-C4X-144521
| CAS No. | CATO-C4X-144521 |
| Molecular Formula | C11H10ClN5OS |
| Molecular Weight | 295.75 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
Tizanidine impurity 21 (CAS CATO-C4X-144521) is a certified pharmaceutical impurity reference standard with the molecular formula C11H10ClN5OS and a molecular weight of 295.75 g/mol.
Structurally, Tizanidine impurity 21 (C11H10ClN5OS) contains a nitrogen-containing heterocyclic scaffold, an amide group, sulfur-containing functionality, a hydroxyl group, an ether linkage, chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 9.0, corresponding to approximately 9 ring(s) or double-bond equivalent(s). With a molecular weight of 295.75 g/mol, it falls into the medium-molecular-weight range. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C11H10ClN5OS |
| Molecular Weight | 295.75 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 5 |
| Sulfur Atoms | 1 |
Related Tizanidine Standards
- Tizanidine Impurity 40 (CAS CATO-C4X-144540)
- Tizanidine Impurity 59 (CAS CATO-C4X-144559)
- Tizanidine Impurity 6 (CAS 173532-15-5)
- Tizanidine Impurity 61 (CAS CATO-C4X-144561)
- Tizanidine impurity 027 (CAS 5391-42-4)
- Tizanidine impurity 30 (CAS CATO-C4X-144530)
- Tizanidine impurity 36 (CAS CATO-C4X-144536)
- Tizanidine Nitroso Impurity 13 (CAS CATO-C4X-144513)
Recommended Standards
- Thiamethoxam D4 (oxadiazine D4) (CAS 1331642-98-8)
- N-{[(4-chlorophenyl)carbamoyl]amino}thiophene-2-carboxamide (CAS 349613-62-3)
- methyl 3-[(2-chlorobenzoyl)amino]-2-thiophenecarboxylate (CAS 478080-02-3)
- Methyl 3-(4-chlorobenzamido)thiophene-2-carboxylate (CAS 544421-24-1)
- Fezolinetant Impurity 31 (CAS CATO-C4X-327031)
- Brivaracetam Impurity 61 (CAS CATO-C4X-200761)
- Crisaborole impurity 119 (CAS CATO-C4X-2021119)
- Tert-butyl 3-(thietan-3-ylamino)azetidine-1-carboxylate (CAS 1877188-98-1)
- 2-Chloro-pyridine-3-yl-acetic acid (CAS 551921-02-9)
- 1-(2-Amino-5-fluoro-3-methoxyphenyl)ethan-1-one (CAS 1232407-23-6)
- (5-Aminofuran-2-yl)methanol (CAS 926652-24-6)
- n-(5-Fluoro-2,3-dihydrobenzofuran-2-yl)methanesulfonamide (CAS 1514804-66-0)
- Carisoprodol Impurity 1 (CAS 20667-05-4)
- Semaglutide impurity 60 (CAS CATO-C4X-222660)
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