The invention relates to compounds of Formula (I) wherein n, X, R1 and R2 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n、X、R1及R2如說明書中所描述;關於其醫藥學上可接受之鹽,及關於該等化合物作為藥劑,尤其作為CXCR3受體調節劑之用途。