TRPM8 antagonist 4 prodrug (Compound 8b) is an orally active CB2R agonist (EC50: 51.2 nM) and a weak TRPM8 antagonist. TRPM8 antagonist 4 prodrug is a prodrug of TRPM8 antagonist 4 (HY-174825). TRPM8 antagonist 4 prodrug exhibits anti-inflammatory and analgesic activities and can be used in the research of inflammation-related pain disorders[1].