Patent ID: 7141579

Claim:
A heterocyclic compound represented by formula I: wherein represents wherein: R 1 represents hydrogen atom, C 1 –C 6 alkyl or benzyloxy; R 2 represents nil; R 3 and R 4 together form: (wherein R 7 represents hydrogen atom, halogen atom, C 1 –C 6 alkoxy, cyano or trifluoromethyl), cyclopentene or cyclopentane, provided that, when represents R 3 is coupled with R 4 into: (wherein R 8 represents halogen atom, C 1 –C 6 alkoxy, cyano or trifluoromethyl), cyclopentene or cyclopentane; where * indicates a permitted point of attachment of said ring to the position on the formula I ring to which R 3 and R 4 bind.