Patent ID: 7419976

Claim:
A compound of formula wherein R 1 is (C 1-4 )alkyl; R 2 is unsubstituted (C 1-4 )alkyl or (C 1-4 )alkyl substituted by unsubstituted or substituted (C 6-18 )aryl wherein the aryl substitutients are halogen, halo(C 1-4 )alkyl, (C 1-4 )alkoxy, cyano, amino, dimethylamino, carboxy (C 1-2 )alkylcarbonylamino, amino(C 1-2 )alkylcarbonylamino, (C 2-4 )alkylenecarbonylamino, or heterocyclylcarbonyl(C 1-2 )alkylcarbonylamino, wherein heterocyclyl has 6 ring members and 2 heteroatoms selected from N, and O; or (C 6-18 )aryl annelated with heterocyclyl having 5 or 6 ring members and 1 to 4 heteroatoms selected from N, O, and S; and wherein the substituents are halogen unsubstituted amino or amino substituted by one or two (C 1-4 ) alkyl, cyano (C 1-4 ) alkoxy, or (C 1-6 ) haloalkyl, and R 3 is (C 6-18 )aryl one or morefold substituted by halogen, halo(C 1-6 )alkyl halo(C 1-6 )alkoxy, cyano, phenyl, or heterocyclyl having 5 to 6 ring members and 1 to 4 heteroatoms selected from N, O, and S.