Abstract: The present invention relates to a compound of Formula (1) wherein Ar1 represent (A) or (B) or (C); R1 is hydrogen, C1-4alkyl or C1-4alkanoyl; R12 and R13 are independently hydrogen or C1-4alkyl; Ar2 is phenyl or heteroaryl; p is 0 or 1; Ar3 is of formula (I) wherein W, X, Y and Z are independently CH or N, provided that at least two of W, X, Y and Z are CH and R2 and —(CH2)nR3 are attached to ring carbon atoms; R2 is a group of Formula (II) or R2 represents a lactone of Formula (III) the group of Formula (II) or (III) having L or D configuration at the chiral alpha carbon in the corresponding free amino acid; n is 0, 1 or 2; R3 is phenyl or heteroaryl; provided that: when n is 0, Ar3 is substituted by R2 in the 4-position and —(CH2)nR3 in the 3- or 5-position; and when n is 1 or 2, Ar3 is substituted by R2 in the 3- or 5-position and —(CH2)nR3 in the 4-position; and R5-R9, m and n are as defined in the specification; or a pharmaceutically-acceptable salt, prodrug or solvate thereof.