Patent ID: 7008962

Claim:
The compound selected from the group consisting of: 3-(2-hydroxy-phenylamino)-4-(2-bromophenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-hydroxy-phenylamino)-4-(2,3-dichlorophenylamino)-cyclobut-3-ene-1,2-dione, 3-(4-nitro-2-hydroxy-phenylamino)-4-phenylamino-cyclobut-3-ene-1,2-dione, 3-(4-cyano-2-hydroxy-phenylamino)-4-phenylamino-cyclobut-3-ene-1,2-dione, 3-(2-methoxy-benzylamino)-4-phenylamino-cyclobut-3-ene-1,2-dione, 3-(4-cyano-2-hydroxy-phenylamino)-4-(2-bromophenylamino)-cyclobut-3-ene-1,2-dione, 3-(4-cyano-2-hydroxy-phenylamino)-4-(2-chlorophenylamino)-cyclobut-3-ene-1,2-dione, 3-(4-cyano-2-hydroxy-phenylamino)-4-(2,3-dichlorophenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-phenylphenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-methoxyphenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-ethylphenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-phenoxyphenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-chlorophenylamino)-cyclobut-3-ene-1,2-dione, 6-Chloro-3-(3,4-dioxo-2-phenylamino-cyclobut-1-enylamino)-2-hydroxy-benzenesulfonamide, 3,4-bis-(4-cyano-2-hydroxyphenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2,3-dimethylphenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-methyl-4-bromophenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-propylphenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-methyl-3-chlorophenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2,3-dimethoxyphenylamino)-cyclobut-3-ene-1,2-dione, 3-(2-Hydroxy-phenylamino)-4-(2-chloro-3-methylphenylamino)-cyclobut-3-ene-1,2-dione, 3-(4-nitro-2-hydroxy-phenylamino)-4-(2-bromophenylamino)-cyclobut-3-ene-1,2-dione, 3-(4-nitro-2-hydroxy-phenylamino)-4-(2-chlorophenylamino)-cyclobut-3-ene-1,2-dione, 3,4-bis-(4-nitro-2-hydroxyphenylamino)-cyclobut-3-ene-1,2-dione, 3-[(2-Hydroxy-phenyl)-methyl-amino]-4-phenylamino-cyclobut-3-ene-1,2-dione, 3-(3-Hydroxy-pyridin-2-ylamino)-4-phenylamino-cyclobut-3-ene-1,2-dione, and or a pharmaceutically acceptable salt thereof.