Patent ID: 8044062

Claim:
A Compound of Formula or a pharmaceutically acceptable salt thereof, wherein R 1 is alkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocycloalkyl, heterocycloalkylalkyl, heteroaryl or heteroarylalkyl; R 2 is hydrogen or alkyl R 4 is alkyl; R 5 is hydrogen; and R 6 is phenyl, acyl, or heteroaryl wherein the phenyl and heteroaryl are is optionally substituted with 1, 2, 3, 4, or 5 R 9 groups; each R 8 , when present, is independently hydroxy, halo, alkoxy, haloalkoxy, amino, alkylamino, dialkylaminoalkyl, or alkoxyalkylamino; and each R 9 , when present, is independently halo, alkyl, haloalkyl, alkoxy, haloalkoxy, cyano, amino, alkylamino, dialkylamino, alkoxyalkyl, carboxyalkyl, alkoxycarbonyl, aminoalkyl, cycloalkyl, aryl, arylalkyl, aryloxy, heterocycloalkyl, or heteroaryl and where the cycloalkyl, aryl, heterocycloalkyl, and heteroaryl, each either alone or as part of another group within R9, are independently optionally substituted with 1, 2, 3, or 4 groups selected from halo, alkyl, haloalkyl, hydroxy, alkoxy, haloalkoxy, amino, alkylamino, and dialkylamino.