PHARMACEUTICAL COMPOSITION FOR TREATING OR PREVENTING ARTHRITIS COMPRISING THE 1,2,4-THIADIAZOLIDINE-3,5-DIONE COMPOUNDS

A novel 1,2,4-thiadiazolidine-3,5-dione compound is provided to show excellent activity and enzyme selectivity on Lck SH2, thereby being usefully used for treating and preventing inflammation related diseases such as rheumatoid arthritis with high selectivity without side effects. A pharmaceutical composition for treating and preventing a disease induced by inflammation comprises a 1,2,4-thiadiazolidine-3,5-dione compound represented by a formula(1) or a pharmaceutically acceptable salt thereof as an effective ingredient. In the formula(1), A is linear or branched saturated or unsaturated C1-7 alkyl, indenyl, (C1-7)alkoxycarbonyl(C1-7)alkyl, phenyl, benzyl or C2H5(C=O)HR2R3(wherein A may be substituted by halogen, carboxyl, C1-7 alkoxycarbonyl, C1-7 alkoxy, nitro or hydroxy when A is alkyl, phenyl or benzyl); R1 is H, linear or branched saturated or unsaturated C1-7 alkyl, (C1-7)alkoxycarbonyl(C1-7)alkyl, phenyl, phenyl(C1-5)alkyl or phenylcarbonylmethyl; and each R2 and R2 is independently H, linear or branched saturated or unsaturated C1-7 alkyl or phenyl, or R2 and R3 may form a ring together with C1-5 alkylene. A pharmaceutical composition for treating and preventing rheumatoid arthritis comprises the 1,2,4-thiadiazolidine-3,5-dione compound of the formula(1) or a pharmaceutically acceptable salt thereof as an effective ingredient.