Provided is a novel COX-1 inhibitor. Specifically, disclosed are a benzanilide derivative represented by general formula (I), and a salt thereof. In the formula, R1 is selected from alkyl, alkenyl, hydrogen, benzyl, and phenethyl, R2 is selected from hydrogen, hydroxy, halogen, alkyl, alkoxy, and trifluoromethyl, and R3 is selected from hydrogen, acyl, and mesyl. W represents CH or N, and X-Y represents CO-NH or NH-CO.