Patent ID: 7629366

Claim:
A compound of the formula [I], or a salt thereof: wherein X is bond, —CH 2 —, —O—, —OCH 2 —, —CH 2 O—, —S— or wherein R 7 is hydrogen or lower alkyl, Y is bond, —O—(CH 2 ) n — wherein n is 1, 2, 3 or 4, —(CH 2 ) m — wherein m is 1, 2, 3 or 4, Z is cyano, tetrazolyl, (benzylsulfonyl)carbamoyl, benzoylsulfamoyl, formyl, carboxy or protected carboxy, R 1 is hydrogen, lower alkyl or halogen, R 2 is hydrogen or an amino protective group, R 3 is hydrogen or lower alkyl, R 4 is hydrogen or lower alkyl, R 5 and R 8 are each independently hydrogen, halogen, hydroxy, lower alkyl, lower alkenyl, lower alkoxy, hyclroxy(lower)alkoxy, mono-halo(lower)alkoxy, di-halo(lower)alkoxy, tri-halo(lower)alkoxy, lower alkoxy(lower)alkoxy, lower alkenyloxy, cyclo(lower)alkyloxy, cyclo(lower)alkyl(lower)alkoxy, benzyloxy, phenoxy, lower alkylthio, cyclo(lower)alkylthio, lower alkylsulfonyl, cyclo(lower)alkylsulfonyl, amino, mono-(lower)alkylamino di-(lower)alkylamino, mono-halo(lower)alkyl, di-halo(lower)alkyl, tri-halo(lower)alkyl cyano, piperidinyl or phenyl, R 6 is hydrogen, lower alkyl or halogen, R 9 is hydrogen or lower alkyl, and i is 1 or 2, provided that (1) when X is bond, —CH 2 —, then R 5 is not hydrogen, or (2) when i is 1, then is not