Patent ID: 7345068

Claim:
An aromatic amino acid derivative represented by formula (I) or its pharmacologically acceptable salt: wherein, X is a halogen atom, an alkyl group or alkoxy group, Y is O or NH, l in (Y) 1 is 0 or 1, m is 0, 1 or 2, n is an integer of 0-5, R 1 is a hydrogen atom or an amino-protecting group, R 2 is a hydrogen atom or an alkyl, aralkyl or aryl group, R 3 is a condensed heterocyclic group selected from the group consisting of benzofuran, benzoxazole, benzoimidazole, benzopyrrole and benzothiazole, wherein said R 3 group is attached to the (Y) 1 —(CH 2 ) n — moiety through the benzo moiety thereof, and wherein said condensed heterocyclic group is optionally substituted with oxo, carboxy, amino, lower alkyl, lower alkoxy, cycloalkyl, di(lower)alkylamino, lower alkoxycarbonyl, phenyl or saturated or unsaturated mono-cyclic heterocyclic group containing N, O and/or S, in which each substituent on the condensed heterocyclic group may be further substituted with halogen atom, hydroxy, lower alkyl, lower alkoxy, phenyl, di(lower)alkylamino, lower alkanoyloxy, bis[halo(lower)alkyl]amino or N-(lower)alkyl-N-hydroxy(lower)alkylamino, provided that m is 1 or 2 in this case.