CAS Registry Number

CAS 77301-42-9 — Naproxen Related Compound K - USP CRS

Naproxen Related Compound K (CAS 77301-42-9) is a structurally similar analog to naproxen, primarily used as a pharmaceutical reference standard for analytical validation, method development, and quality control in drug manufacturing. It serves as a comparator in HPLC, LC-MS, and spectroscopic studies to ensure consistency in active pharmaceutical ingredient (API) production. This compound has the molecular formula H3COC10H6CH(OH)CH3 and a molecular weight of 202.25 g/mol. It is stable at ambient storage conditions and carries a signal word of "Warning" per GHS classification. Molekula supplies Naproxen Related Compound K from research to bulk quantities with full documentation and ISO 9001:2015 traceability.