samples. The analogous racemic sample including MBA leads, on the opposite, to the same crystal motif found for R/S samples crystallizing, however, in the achiral orthorhombic space group Aea2. This last was the only crystal structure that we have not determined relying on a previous literature report. The stability of all the six samples has been checked by differential scanning calorimetry (DSC) in the temperature range -80-130°C (DSC) both during cooling and a) b) c)