Patent ID: 7790748

Claim:
A compound of formula (I): wherein: a) each R 1 is independently chosen from hydrogen, halo, cyano, hydroxy, carboxy, keto, thioketo, amino, acylamino, acyl, amido, aryloxy, alkyl, alkenyl, alkynyl, heteroalkyl, haloalkyl, alkoxy, aryl, and cycloalkyl; b) each R 2 is independently chosen from hydrogen, halo, cyano, hydroxy, carboxy, keto, thioketo, amino, acylamino, acyl, amido, phenyl, aryloxy, alkyl, alkenyl, alkynyl, heteroalkyl, haloalkyl, alkoxy, aryl, and cycloalkyl; c) R 3 and R 4 , together with the nitrogen atom to which they are bonded, join to form a piperidin-1-yl unit, optionally substituted with one or more halo, cyano, hydroxy, carboxy, keto, thioketo, amino, acylamino, acyl, amido, alkyl, alkenyl, alkynyl, heteroalkyl, haloalkyl, alkoxy, substituted or unsubstituted aryl, wherein the aryl ring can be substituted with from 1 to 4 halo, cyano, hydroxy, carboxy, keto, thioketo, amino, acylamino, acyl, amido, aryloxy, alkyl, alkenyl, alkynyl, and combinations thereof; and d) R 5 and R 6 are each independently chosen from of hydrogen, halo, cyano, hydroxy, carboxy, keto, thioketo, amino, acylamino, acyl, amido, aryloxy, alkyl, alkenyl, alkynyl, heteroalkyl, haloalkyl, alkoxy, aryl, and cycloalkyl; or optical isomers, diastereomers and enantiomers of the formula above, or a pharmaceutically-acceptable salt.