Patent ID: 8258306

Claim:
A compound represented by the formula: wherein; R 1 and R 2 are independently hydrogen or alkyl; R 3 is independently hydrogen or alkyl; and R 4 is methyl; and Ar 1 and Ar 2 are independently aryl, or cycloalkyl, where each of the aforementioned ring is optionally substituted with R a , R b or R c where R a is alkyl, halo, haloalkyl, haloalkoxy, alkylthio, cyano, alkoxy, amino, monosubstituted amino, disubstituted sulfonyl, acyl, carboxy, alkylcarbonyl, hydroxyalkyl, alkoxyalkyl, hydroxyalkoxy, alkoxyalkoxy, aminoalkoxy, aminosulfonyl, aminocarbonyl, or acylamino and R b and R c are independently selected from alkyl, halo, haloalkyl, haloalkoxy, alkylthio, cyano, alkoxy, monosubstituted amino, disubstituted amino, sulfonyl, acyl, carboxy, alkoxycarbonyl, hydroxyalkyl, alkoxyalkyl, aminoalkyl, hydroxyalkoxy, alkoxyaloxy, aminoalkoxy, aminosulfonyl, aminocarbonyl, acylamino, aryl, heteroaryl, cycloalkyl, or heterocyclyl where the aromatic or alicyclic ring in R a , R b and R c is optionally substituted with R d , R e or R f which are independently selected from alkyl, halo, haloalkyl, haloalkoxy, alkylthio, cyano, alkoxy, amino, monosubstituted amino, disubstituted amino, sulfonyl, acyl, carboxy, alkoxycarbonyl, hydroxyalkyl, alkoxyalkyl, aminoalkyl, hydroxyalkoxy, alkoxyalkoxy, aminoalkoxy, aminosulfonyl, aminocarbonyl, or acylamino.