Patent ID: 7858626

Claim:
A compound of formula (II): or a salt thereof, wherein: X 1 is methyl or ethyl; X 2 is hydrogen or methyl; X 3 is hydrogen; X 4 is hydrogen, methyl, or ethyl; W is N; Q 1 is hydrogen, chlorine, or methoxy; Q 2 is A 1 or A 2 ; Q 3 is A 1 when Q 2 is A 2 and Q 3 is A 2 when Q 2 is A 1 ; wherein A 1 is hydrogen, methyl, or chlorine, and A 2 is the group defined by -(Z) m -(Z 1 )-(Z 2 ), wherein Z is CH 2 and m is 0, 1, 2, or 3, or Z is NR 2 and m is 0 or 1, or Z is CH 2 NR 2 and m is 0 or 1; Z 1 is S(O) 2 , and Z 2 is C 1 -C 4 alkyl or NR 3 R 4 ; and R 2 , R 3 , and R 4 are each independently selected from hydrogen and C 1 -C 4 alkyl.