Sulfameter (CAS 21312-10-9) is a synthetic sulfonamide antibiotic and a specialty chemical used primarily as an analytical reference standard in pharmaceutical quality control and research. It serves as a certified reference material for method development, validation, and calibration in HPLC, GC, and other analytical techniques to ensure accurate quantification of sulfameter residues or active ingredients in drug formulations. As a niche additive in medicinal chemistry, it inhibits bacterial folate synthesis by mimicking p-aminobenzoic acid (PABA). Molecular formula: C₉H₁₁N₃O₃S; Molecular weight: 241.27 g/mol. This high-purity (99-100%) reagent is essential for compliance with pharmacopeial standards (e.g., USP, EP) and is not intended for direct therapeutic use.