Figure 1: Formulae of compounds addressed in this work.

FLFL is the natural dipeptide while FDFD is its mirror image. In the unprotected version X=H, while Boc stands for tert-butoxycarbonyl and Fmoc stands for 9-fluorenylmethoxycarbonyl.

FLFL is the natural dipeptide while FDFD is its mirror image. In the unprotected version X=H, while Boc stands for tert-butoxycarbonyl and Fmoc stands for 9-fluorenylmethoxycarbonyl.