The invention relates to compounds of Formula (I) wherein R1, R2, R3, R4 and R5 are as described in the description to pharmaceutically acceptable salts thereof, and to the use of such compounds as medicaments, especially as modulators of the CXCR3 receptor.本發明係關於式(I)化合物,其中R1、R2、R3、R4及R5係如說明書中所述;其醫藥上可接受之鹽及該等化合物作為藥劑、尤其作為CXCR3受體之調節劑的用途。