Patent ID: 7030144

Claim:
A compound of the formula: or a pharmaceutically acceptable salt thereof, wherein: R 1 represents 5- to 10-membered aryl or heteroaryl, which is unsubstituted or substituted with from 1 to 4 groups independently selected from R 5 ; R 2 represents C 1 –C 8 alkyl, C 2 –C 8 alkenyl, C 2 –C 8 alkynyl, C 3 –C 10 cycloalkyl or (C 3 –C 10 cycloalkyl)C 1 –C 8 alkyl, each of which is unsubstituted or substituted with from 1 to 3 substituents independently selected from R 5 ; R 3 and R 4 are each independently selected from: (a) hydrogen, halogen, nitro and cyano; and (b) groups of the formula: wherein: (i) G is a bond, C 1 –C 8 alkylene, —NH—, —N(R B )—, —(R B )N— —O—, —C(═O)—, —C(═O)NH—, —C(═O)NR B —, —S(O) m —, —CH 2 C(═O)—, —S(O) m NH—, —S(O) m NR B —, —NHC(═O)—, —C(═NR B )—, HC═N—, —NR B C(═O)—, —NHS(O) m — or —NR B S(O)—; and (ii) R A and R B are independently selected from C 1 –C 8 alkyl, C 2 –C 8 alkenyl, and C 2 –C 8 alkynyl; and (iii) m is 0, 1 or 2; and R 5 is independently selected at each occurrence from halogen, hydroxy, nitro, cyano, amino, C 1 –C 8 alkyl, C 1 –C 8 alkoxy, mono- and di(C 1 –C 8 alkyl)amino, C 3 –C 10 cycloalkyl, (C 3 –C 10 cycloalkyl)alkyl, (C 3 –C 10 cycloalkyl)alkoxy, C 2 –C 9 heterocycloalkyl, C 1 –C 8 alkenyl, C 1 –C 8 alkynyl, halo(C 1 –C 8 )alkyl, halo(C 1 –C 8 )alkoxy, oxo, amino(C 1 –C 8 )alkyl and mono- and di(C 1 –C 8 alkyl)amino(C 1 –C 8 )alkyl.