4-(Methylsulfinyl)benzoic acid is a key sulfoxide intermediate used in pharmaceutical synthesis, particularly as Etoricoxib Impurity 48. It exhibits a melting point of 229°C and predicted boiling point of 403.3±28.0°C at 760 mmHg. The compound has a density of 1.44±0.1 g/cm³ and should be stored at 2-8°C under inert atmosphere. As a sulfoxide derivative, it serves as a versatile building block for COX-2 inhibitors and other bioactive molecules. Safety precautions include wearing protective equipment due to potential irritation (GHS Category 2).
