80789-74-8 Isatin-5-sulfonic acid 1H-Indole-5-sulfonic acid, 2,3-dihydro-2,3-dioxo-, sodium salt 1H-Indole-5-sulfonic acid, 2,3-dihydro-2,3-dioxo-, monosodium salt 5-Indolinesulfonic acid, 2,3-dioxo- Isatin-5-sulfonic acid sodium salt Sodium 5-sulfoisatin Sodium 5-isatinsulfonate CAS 80789-74-8
| CAS No. | 80789-74-8 |
| Molecular Formula | C8H4NO5S |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
80789-74-8 Isatin-5-sulfonic acid 1H-Indole-5-sulfonic acid, 2,3-dihydro-2,3-dioxo-, sodium salt 1H-Indole-5-sulfonic acid, 2,3-dihydro-2,3-dioxo-, monosodium salt 5-Indolinesulfonic acid, 2,3-dioxo- Isatin-5-sulfonic acid sodium salt Sodium 5-sulfoisatin Sodium 5-isatinsulfonate (CAS 80789-74-8), molecular formula C8H4NO5SNa and molecular weight 249.17 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 80789-74-8 Isatin-5-sulfonic acid 1H-Indole-5-sulfonic acid, 2,3-dihydro-2,3-dioxo-, sodium salt 1H-Indole-5-sulfonic acid, 2,3-dihydro-2,3-dioxo-, monosodium salt 5-Indolinesulfonic acid, 2,3-dioxo- Isatin-5-sulfonic acid sodium salt Sodium 5-sulfoisatin Sodium 5-isatinsulfonate (C8H4NO5SNa) contains a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 7.5, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 249.17 g/mol, it falls into the medium-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 | C8H4NO5S Na |
| Molecular Weight | 249.17 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1980 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Isatin Standards
Recommended Standards
- 2-(2-Oxo-2',3',5',6'-tetrahydrospiro[indoline-3,4'-pyran]-1-yl)acetic acid (CAS 880079-26-5)
- 2,4-Dibromo-3-fluorobenzonitrile (CAS 1803816-99-0)
- rel-(5R,6S)-5-amino-6-phenylpiperidin-2-one (CAS 61298-37-1)
- 4-Fluoro-N-[2-nitro-2-(phenylsulfonyl)vinyl]aniline (CAS 321433-82-3)
- 1,3-Bis(prop-2-yn-1-yloxy)-2-((prop-2-yn-1-yloxy)methyl)propan-2-amine (CAS 1313375-59-5)
- 5,7-Dichloro-N-(3-chlorophenyl)thiazolo[4,5-d]pyrimidine-2-sulfonamide (CAS 1000576-36-2)
- 6-Chloro-2-methyl-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (CAS 65866-54-8)
- 3084-53-5 J59NCR7385 Trimethylsulfonium bromide Sulfonium, trimethyl-, bromide (1:1) Sulfonium, trimethyl-, bromide UNII-J59NCR7385 (CAS 3084-53-5)
- 4-Bromo-1H-imidazole-2-carboxamide (CAS 1823952-84-6)
- Semaglutide Impurity 145 (CAS CATO-C4X-2226145)
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