A compound of formula (Ia), or the pharmaceutically acceptable salt thereof, wherein, R 1 and R 2 are selected from hydrogen and halogen; R 3 is selected from the group consisting of hydrogen, halogen, -OH, -CN, -NO 2 , -NH 2 , -C 1-10 alkyl,-C 3-10 cycloalkyl, -O-C 1-8 alkyl, -O-C 1-8 alkyl (alkoxy), -O- C 3-8 cycloalkyl (cyclalkoxy), -S-C 1-8 alkyl (thioalkoxy), -C(O)-C 1-8 alkyl, -COOH, -C(O)NH 2 , -C(O)NH-C 1-8 alkyl, -C(O)N(C 1-8 alkyl) 2 ,-C(O)O-C 1-8 alkyl, -C 1-8 haloalkyl (haloalkoxy), -C 3-8 alkenyl, -C 3-8 alkynyl, -OC(O)-NH 2 , -OC(O)-NH(C 1-8 alkyl), -OC(O)-N(C 1-8 alkyl) 2 , -NH(C 1-8 alkyl), -N(C 1-8 alkyl) 2 , -NH-SO 2 -C 1-8 alkyl, -N(C 1-8 alkyl)-SO 2 -C 1-8 alkyl, -NH-C(O)-(C 1-8 alkyl), -N(C 1-8 alkyl)-C(O)-(C 1-8 alkyl), -NH-C(O)O-C 1-8 alkyl, -N(C 1-8 alkyl)-C(O)O-C 1-8 alkyl, -NH-C(O)-NH 2 , -NH-C(O)-NH(C 1-8 alkyl), -N(C 1-8 alkyl)-C(O)-NH(C 1-8 alkyl), -N(C 1-8 alkyl)-C(O)-N(C 1-8 alkyl) 2 , -NH-C(O)-NH-SO 2 -C 1-8 alkyl, -N(C 1-8 alkyl)-C(O)-NHSO 2 -C 1-8 alkyl, -N(C 1-8 alkyl)-C(O)-N(C 1-8 alkyl)-SO 2 -C 1-8 alkyl, -S-C 1-8 alkyl, -S(O)-C 1-8 alkyl, -SO 2 -C 1-8 alkyl, -S-aryl, -S(O)-aryl, SO 2 -aryl, -SO 2 NH 2 , -SO 2 NH-(C 1-8 alkyl), -SO 2 N(C 1-8 alkyl) 2 ; W is -CH=; X is -CH=CH-; Y is -CH=CH-; Z is a bond; A is -OR; P is selected from the group consisting of -O-, -S-- and -NR-; Q is a group selected from hydrogen, OR, -COOR, -CONRR', -CONHSO 2 R, -NHCO(CRR')-COOR, -C(R,R')OH or -OCH 2 C(R,R')OH; R and R' are independently selected from the group consisting of hydrogen, -C 1-6 alkyl, -C 3-6 cycloalkyl, -C 1-3 alkyl (cycloalkyl), -C 3-6 alkenyl and -C 3-6 alkynyl or, R and R' along with the atom to which they are attached, together can form a substituted or unsubstituted 5 to 8 membered cyclic ring; 'm' is an integer selected from 0 to 4, both inclusive. R 1 and R 2 are selected from hydrogen and halogen; R 3 is selected from the group consisting of hydrogen, halogen, -OH, -CN, -NO 2 , -NH 2 , -C 1-10 alkyl,-C 3-10 cycloalkyl, -O-C 1-8 alkyl, -O-C 1-8 alkyl (alkoxy), -O- C 3-8 cycloalkyl (cyclalkoxy), -S-C 1-8 alkyl (thioalkoxy), -C(O)-C 1-8 alkyl, -COOH, -C(O)NH 2 , -C(O)NH-C 1-8 alkyl, -C(O)N(C 1-8 alkyl) 2 ,-C(O)O-C 1-8 alkyl, -C 1-8 haloalkyl (haloalkoxy), -C 3-8 alkenyl, -C 3-8 alkynyl, -OC(O)-NH 2 , -OC(O)-NH(C 1-8 alkyl), -OC(O)-N(C 1-8 alkyl) 2 , -NH(C 1-8 alkyl), -N(C 1-8 alkyl) 2 , -NH-SO 2 -C 1-8 alkyl, -N(C 1-8 alkyl)-SO 2 -C 1-8 alkyl, -NH-C(O)-(C 1-8 alkyl), -N(C 1-8 alkyl)-C(O)-(C 1-8 alkyl), -NH-C(O)O-C 1-8 alkyl, -N(C 1-8 alkyl)-C(O)O-C 1-8 alkyl, -NH-C(O)-NH 2 , -NH-C(O)-NH(C 1-8 alkyl), -N(C 1-8 alkyl)-C(O)-NH(C 1-8 alkyl), -N(C 1-8 alkyl)-C(O)-N(C 1-8 alkyl) 2 , -NH-C(O)-NH-SO 2 -C 1-8 alkyl, -N(C 1-8 alkyl)-C(O)-NHSO 2 -C 1-8 alkyl, -N(C 1-8 alkyl)-C(O)-N(C 1-8 alkyl)-SO 2 -C 1-8 alkyl, -S-C 1-8 alkyl, -S(O)-C 1-8 alkyl, -SO 2 -C 1-8 alkyl, -S-aryl, -S(O)-aryl, SO 2 -aryl, -SO 2 NH 2 , -SO 2 NH-(C 1-8 alkyl), -SO 2 N(C 1-8 alkyl) 2 ; W is -CH=; X is -CH=CH-; Y is -CH=CH-; Z is a bond; A is -OR; P is selected from the group consisting of -O-, -S-- and -NR-; Q is a group selected from hydrogen, OR, -COOR, -CONRR', -CONHSO 2 R, -NHCO(CRR')-COOR, -C(R,R')OH or -OCH 2 C(R,R')OH; R and R' are independently selected from the group consisting of hydrogen, -C 1-6 alkyl, -C 3-6 cycloalkyl, -C 1-3 alkyl (cycloalkyl), -C 3-6 alkenyl and -C 3-6 alkynyl or, R and R' along with the atom to which they are attached, together can form a substituted or unsubstituted 5 to 8 membered cyclic ring; 'm' is an integer selected from 0 to 4, both inclusive. <EOS>