Patent ID: 7781592

Claim:
A thione derivative represented by formula 1: wherein: A and B each independently represent O, S, NR 2 ; wherein R 2 represents hydrogen, C 1 -C 4 alkyl, C 1 -C 4 alkenyl, or aryl; Ar represents aryl; heteroaryl; aryl or heteroaryl substituted with one to five radicals independently selected from the group consisting of C 1 -C 4 alkyl, C 1 -C 4 alkoxy, halogen, trifluoromethyl, nitro, acetoxy, amino, C 1 -C 3 alkylamino, C 1 -C 3 dialkylamino, hydroxy, C 1 -C 3 hydroxyalkyl, and thioxy; and R 1 represents hydrogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, halogen, cyano, nitro, hydroxy, amino, C 1 -C 4 alkylamino, or C 1 -C 4 dialkylamino; or a non-toxic salt thereof.