Compounds 5j, 5l, 5p, 5r, 5q, 5m, 5o, 5s, 5u, 5d, 5a and 5c showed to be of high activities relative to that of the reference drug Loratadine (Clorinix®) (Table 3). It could be in relation with the presence of Valine (5j 98% and 5l 97%) and tyrosine (5p 96%, 5r 94% and 5q 90%) residues, also, the methyl piperazine segment showed to be more active than 4-fluorophenyl and 4-ethoxycar-bonyl one (Table 3).