Patent ID: 7378524

Claim:
A compound of formula (I): wherein each of R 1 and R 2 , independently, is H or C 1 -C 8 alkyl; each of R 3 and R 4 , independently, is H or -A-N(B)-D; at most one of R 3 and R 4 being H; and each of R 5 , R 6 , R 7 , and R 8 , independently, is H, C 1 -C 8 alkyl, or halogen; in which A is C 1 -C 12 alkyl optionally containing 1-6 heteroatoms; B is H or C 1 -C 8 alkyl; and D is C 1 -C 8 alkyl, C 3 -C 8 cycloalkyl, C 3 -C 8 heterocycloalkyl, aryl, heteroaryl, —C(O)R a , —SO 2 R a , —C(═N—CN)—SR a , —C(═N—CN)—NR a R a ′, or —C(═N—C(O)NH 2 )—SR a ; or B and D together are C 5 -C 7 heterocycloalkyl or heteroaryl; each of R a and R a ′, independently, being H, C 1 -C 8 alkyl, C 2 -C 8 alkenyl, C 2 -C 8 alkynyl, C 3 -C 8 cycloalkyl, C 5 -C 8 cycloalkenyl, C 3 -C 8 heterocycloalkyl, C 5 -C 8 heterocycloalkenyl, aryl, or heteroaryl; or a salt thereof.