Isothiazolo[5,4-d]pyrimidine CAS 272-26-4

Purity 97%+In StockPharmaceutical Standards
CAS No.272-26-4
Molecular FormulaC5H3N3S
Molecular Weight137.16 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

Isothiazolo[5,4-d]pyrimidine CAS 272-26-4 chemical structure

Description

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.

CATO supplies Isothiazolo[5,4-d]pyrimidine (CAS 272-26-4), a certified reference material (molecular formula C5H3N3S, MW 137.16 g/mol) for analytical method development and quality control.

Structurally, Isothiazolo[5,4-d]pyrimidine (C5H3N3S) contains a nitrile group, sulfur-containing functionality. 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 137.16 g/mol, it falls into the low-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.

As a certified reference material (CRM), Isothiazolo[5,4-d]pyrimidine meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.

Physical & Chemical Properties

Molecular FormulaC5H3N3S
Molecular Weight137.16 g/mol
Purity97%+
StorageStore at 2-8°C, protect from light
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityLight-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)6.0
UV AbsorptionUV-absorbing
CAS Registry Year (est.)1957
Nitrogen Atoms3
Sulfur Atoms1

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