Patent ID: 7244747

Claim:
A compound having formula I, their tautomers, geometrical isomers, enantiomers, diastereoisomers and mixtures thereof, or pharmaceutically acceptable salts thereof, wherein R 1 is hydrogen; C 1-20 alkyl; C 3-8 cycloalkyl; halogen; hydroxy; alkoxy; aryloxy; amido; cyano; nitro; amino; guanidine; alkylamino; arylamino; alkylthio; arylthio; alkylsulfonyl; arylsulfonyl; alkylsulfinyl; arylsulfinyl; aryl; heterocycle; aminocarbonyl; or COOR c , wherein R c is alkyl or aryl; R 2 is hydrogen; C 1-20 alkyl; alkoxy; amino; halogen; hydroxy; amido; nitro; carbamate; cyano; aryl; or COOR c , wherein R c is alkyl or aryl; R 3 is hydrogen; C 1-20 alkyl; alkoxy; amino; halogen; hydroxy; amido; nitro; carbamate; cyano; aryl; or COOR c , wherein R c is alkyl or aryl; R 4 is hydrogen; C 1-20 alkyl; C 2-12 alkenyl; C 2-12 alkynyl; aryl; azido; alkoxycarbonylamino; arylsulfonyloxy; or heterocycle; R 4a is hydrogen; or C 1-20 alkyl; R 5 is hydrogen; R 6 is hydrogen; or C 1-20 alkyl; and R 7 is hydrogen.