A compound having formula and the salts and stereoisomers thereof, wherein R 1 is hydrogen, halo, hydroxy, nitro, cyano, carboxyl, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 alkoxyC 1-6 alkyl, C 1-6 alkylcarbonyl, amino, mono- or diC 1-6 alkylamino, azido, mercapto, polyhaloC 1-6 alkyl, and polyhaloC 1-6 alkoxy, aryl, Het; R 2 is C 3-7 cycloalkyl optionally substituted with C 1-6 alkyl; C 1-6 alkyl optionally substituted with C 3-7 cycloalkyl or aryl; C 2-6 alkenyl optionally substituted with C 3-7 cycloalkyl or aryl; aryl; Het; or -NR 4a R 4b, wherein R 4a and R 4b are, each independently, C 1-6 alkyl, or R 4a and R 4b together with the nitrogen to which they are attached form a 5- or 6-membered saturated heterocyclic ring; R 3 is C 1-6 alkylcarbonyl, C 1-6 alkyl substituted with aryl, C 1-6 alkoxyC 1-6 alkyl, or C 3-7 cycloalkyl, C 1-6 alkyl substituted with Het; n is one, two, three, four or five; each aryl as a group or part of a group is phenyl or naphthalenyl, each optionally substituted with one, two or three substituents selected from halo, hydroxy, nitro, cyano, carboxyl, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 alkoxyC 1-6 alkyl, C 1-6 alkylcarbonyl, amino, mono- or diC 1-6 alkylamino, azido, mercapto, polyhaloC 1-6 alkyl, and polyhaloC 1-6 alkoxy; each Het as a group or part of a group is a monocyclic ring with 5 or 6 ring atoms or a bicyclic ring structure comprising a 6 membered ring fused to a 4, 5, or 6 membered ring; each of the rings being saturated, partially unsaturated, or completely unsaturated; at least one of the rings containing 1 to 4 heteroatoms each independently selected from nitrogen, oxygen and sulphur; and any one of the rings being optionally substituted with one, two or three substituents each independently selected from the group consisting of halo, hydroxy, nitro, cyano, carboxyl, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 alkoxyC 1-6 alkyl, C 1-6 alkylcarbonyl, amino, mono- or diC 1-6 alkylamino, azido, mercapto, polyhaloC 1-6 alkyl, polyhaloC 1-6 alkoxy, and C 3-7 cycloalkyl; R 1 is hydrogen, halo, hydroxy, nitro, cyano, carboxyl, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 alkoxyC 1-6 alkyl, C 1-6 alkylcarbonyl, amino, mono- or diC 1-6 alkylamino, azido, mercapto, polyhaloC 1-6 alkyl, and polyhaloC 1-6 alkoxy, aryl, Het; R 2 is C 3-7 cycloalkyl optionally substituted with C 1-6 alkyl; C 1-6 alkyl optionally substituted with C 3-7 cycloalkyl or aryl; C 2-6 alkenyl optionally substituted with C 3-7 cycloalkyl or aryl; aryl; Het; or -NR 4a R 4b, wherein R 4a and R 4b are, each independently, C 1-6 alkyl, or R 4a and R 4b together with the nitrogen to which they are attached form a 5- or 6-membered saturated heterocyclic ring; R 3 is C 1-6 alkylcarbonyl, C 1-6 alkyl substituted with aryl, C 1-6 alkoxyC 1-6 alkyl, or C 3-7 cycloalkyl, C 1-6 alkyl substituted with Het; n is one, two, three, four or five; each aryl as a group or part of a group is phenyl or naphthalenyl, each optionally substituted with one, two or three substituents selected from halo, hydroxy, nitro, cyano, carboxyl, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 alkoxyC 1-6 alkyl, C 1-6 alkylcarbonyl, amino, mono- or diC 1-6 alkylamino, azido, mercapto, polyhaloC 1-6 alkyl, and polyhaloC 1-6 alkoxy; each Het as a group or part of a group is a monocyclic ring with 5 or 6 ring atoms or a bicyclic ring structure comprising a 6 membered ring fused to a 4, 5, or 6 membered ring; each of the rings being saturated, partially unsaturated, or completely unsaturated; at least one of the rings containing 1 to 4 heteroatoms each independently selected from nitrogen, oxygen and sulphur; and any one of the rings being optionally substituted with one, two or three substituents each independently selected from the group consisting of halo, hydroxy, nitro, cyano, carboxyl, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 alkoxyC 1-6 alkyl, C 1-6 alkylcarbonyl, amino, mono- or diC 1-6 alkylamino, azido, mercapto, polyhaloC 1-6 alkyl, polyhaloC 1-6 alkoxy, and C 3-7 cycloalkyl;