Tizanidine EP Impurity D HI CAS 51323-03-6
| CAS No. | 51323-03-6 |
| Molecular Formula | C8H7ClN4S2 |
| Molecular Weight | N/A |
| 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 EP Impurity D HI (CAS 51323-03-6) is a certified pharmaceutical impurity reference standard with the molecular formula C8H7ClN4S2HI and a molecular weight of 386.65 g/mol.
Structurally, Tizanidine EP Impurity D HI (C8H7ClN4S2HI) contains a nitrogen-containing heterocyclic scaffold, a nitrile group, sulfur-containing functionality, chlorine/iodine substitution. The molecule exhibits a degree of unsaturation (DBE) of 6.0, corresponding to approximately 6 ring(s) or double-bond equivalent(s). With a molecular weight of 386.65 g/mol, it falls into the moderately-high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C8H7ClN4S2 HI |
| Molecular Weight | 386.65 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light |
| 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1971 |
| Halogen Content | Cl/I-containing |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 2 |
Related Tizanidine Standards
- Tizanidine EP Impurity C (CAS 1147548-83-1)
- Tizanidine EP Impurity F (CAS 1147548-85-3)
- Tizanidine-d4 Hydrochloride (CAS 1188263-51-5)
- Tizanidine-D4 (CAS 1188331-19-2)
- Tizanidine Guanidine Impurity (CAS 125292-37-7)
- Tizanidine Impurity 44 (CAS 13907-88-5)
- Tizanidine RC 1 (CAS 1391053-77-2)
- Tizanidine Impurity 6 (CAS 173532-15-5)
Recommended Standards
- Flurbiprofen Impurity 55 (CAS 42771-82-4)
- Dronedarone Impurity 72 Mesylate (CAS CATO-C4X-109272)
- Metoclopramide Impurity 65 (CAS CATO-C4X-141565)
- 1-Bromo-11-iodoundecane (CAS 139123-69-6)
- 4-(3-Bromo-4-fluorophenyl)-2,6-dichloropyrimidine (CAS 1494714-54-3)
- 2,2-Diethyldihydro-2H-pyran-4(3H)-one (CAS 78585-51-0)
- N-[(4Z)-3-Ethyl-2-oxo-1,2,3,4-tetrahydroquinazolin-4-ylidene]thiophene-2-carboxamide (CAS 478033-07-7)
- Diisopropyl (2-hydroxypropan-2-yl)phosphonate (CAS 89865-29-2)
- 4-Amino-5-((2,5-dichlorophenoxy)methyl)-4h-1,2,4-triazole-3-thiol (CAS 871217-87-7)
- Des-Pro31-Tirzepatide (CAS CATO-CPTD788943)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com