Patent ID: 7524840

Claim:
A compound of formula IV, wherein R 1 is alkyl, alkoxy, halogen, COOH, COOAlkyl, CN, C(O)N(R 6 ) 2 , or (OCH 2 CH 2 ) n OCH 3 ; R 2 is alkyl, halogen, alkyl substituted by halogen, OH, alkoxy, alkoxy substituted by halogen, phenyl, N(R 6 ) 2 , (OCH 2 CH 2 ) n OCH 3 , O(CH 2 ) m NR 7 R 8 , or is a 6-membered heterocycle optionally substituted by alkyl or C(O)OR 6 ; or R 1 and R 2 together form a 5-membered heterocyclic ring; R 3 is hydrogen or alkyl; R 4 is hydrogen, halogen, CN, NO 2 , alkyl, or alkoxy; each R 6 is independently hydrogen or alkyl; R 7 and R 8 are each independently hydrogen, alkyl, or alkoxyalkyl, or R 7 and R 8 taken together with the nitrogen atom to which they are attached form a 6-membered heterocycle which is optionally substituted by alkyl; each n is independently 1, 2, or 3; and m is 2, 3, or 4; or a pharmaceutically acceptable salt thereof.