Prophylactic or therapeutic method for sjogren's syndrome

A method for the prophylaxis or treatment of Sjogren's syndrome, comprising administering an effective amount of a compound represented by the formula (I):

• wherein n is an integer of 1-3;
• R is each independently an aliphatic group, haloalkyl, aryl, arylalkyl, alkoxy, cycloalkoxy, haloalkoxy, aryloxy, arylalkoxy, alkylthio, a halogen atom, nitro, cyano, hydroxy, NR1CO2R2, C(O)N(R1)2, C(O)R2, CO2R2, OC(O)N(R1)2, OC(O)R2, N(R1)2 or NR1C(O)R2;
• or two adjacent R groups form, together with an atom bonded thereto, a condensed, saturated, unsaturated, or partially unsaturated 5- to 7-membered ring having 0, 1 or 2 hetero atoms selected from N, O and S;
• R1 is each independently a hydrogen atom or an aliphatic group;
• and
• R2 is an aliphatic group,
• or a pharmaceutically acceptable salt thereof, to a subject in need thereof.