4-Oxo-4H-9-thia-1,4a-diaza-fluorene-3-carboxylic acid CAS 21786-97-0
| CAS No. | 21786-97-0 |
| Molecular Formula | C11H6N2O3S |
| Molecular Weight | 246.24 g/mol |
| 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.
4-Oxo-4H-9-thia-1,4a-diaza-fluorene-3-carboxylic acid (CAS 21786-97-0), molecular formula C11H6N2O3S and molecular weight 246.24 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 4-Oxo-4H-9-thia-1,4a-diaza-fluorene-3-carboxylic acid (C11H6N2O3S) 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 10.0, corresponding to approximately 10 ring(s) or double-bond equivalent(s). With a molecular weight of 246.24 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.
CATO manufactures 4-Oxo-4H-9-thia-1,4a-diaza-fluorene-3-carboxylic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C11H6N2O3S |
| Molecular Weight | 246.24 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) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Recommended Standards
- 4-Oxo-4H-[1,3]thiazino[3,2-a]benzimidazole-2-carboxylic acid (CAS 69469-81-4)
- 4-Oxo-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-2-carboxylic acid (CAS 380348-51-6)
- 4-Methylphenyl 4-fluoropyridin-2-ylcarbamate (CAS 1993309-93-5)
- 5-(1,1-dioxidotetrahydrothien-3-yl)pyrimidine-2,4,6(1H,3H,5H)-trione (CAS 92259-24-0)
- 2-((4-Chloro-3-fluorobenzyl)amino)ethan-1-ol (CAS 1251212-81-3)
- Atropine sulfate (CAS 55-48-1)
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- 4-((6-Fluoro-2,3-dihydro-2-methyl-3-oxobenzo[b][1,4]oxazin-4-yl)methyl)benzoic Acid (CAS 1159978-67-2)
- Semaglutide impurity 268 (CAS CATO-C4X-2226268)
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