Patent ID: 8558009

Claim:
A compound of formula (I) their tautomeric forms, their stereoisomers, and their pharmaceutically acceptable salts, wherein R 2 and R 3 represent hydrogen, and R 1 is methyl, R 4 may be same or different, and represent hydrogen, cyano, or substituted or unsubstituted groups selected from linear (C 1 -C 6 )alkyl, branched (C 1 -C 6 )alkyl, aryl, aralkyl, heterocyclyl, heteroaryl, heterocyclyl(C 1 -C 6 )alkyl, heteroar(C 1 -C 6 )alkyl, acyl, acyloxy, mono-substituted or di-substituted aminoalkyl, alkoxyalkyl, aryloxyalkyl, aralkoxyalkyl, (C 1 -C 6 )alkylthio, thio(C 1 -C 6 )alkyl, arylthio; n represents an integer 2, W represents O; Ar represents a substituted or unsubstituted divalent single or fused aromatic, heteroaromatic group; R 5 and R 6 represent both hydrogen or together represent a bond; X represents O; R 7 represents hydrogen, substituted or unsubstituted groups selected from linear and branched (C 1 -C 12 )alkyl; Y represents O; Z represents O; R 8 represents hydrogen, substituted or unsubstituted groups selected from linear (C 1 -C 6 )alkyl and branched (C 1 -C 6 )alkyl.