3-Methyl-7-(2-nitrophenyl)isoxazolo[4,5-d]pyridazin-4(5H)-one CAS 923569-70-4

Description

Compared with other compounds in its class, the molecular weight of 272.22 g/mol gives 3-Methyl-7-(2-nitrophenyl)isoxazolo[4,5-d]pyridazin-4(5H)-one distinctive chromatographic separation conditions and mass-spectrometry parameter settings.

3-Methyl-7-(2-nitrophenyl)isoxazolo[4,5-d]pyridazin-4(5H)-one (CAS 923569-70-4), molecular formula C12H8N4O4 and molecular weight 272.22 g/mol, is a CATO reference standard with documented purity and traceability.

Based on its molecular formula C12H8N4O4, 3-Methyl-7-(2-nitrophenyl)isoxazolo[4,5-d]pyridazin-4(5H)-one contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 272.22 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.

This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.

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

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