Esters and amides of a series of N-acylprolyl-containing dipeptides were synthesized. It was established that these substances possess the ability to prevent memory decline evoked by maximal electroshock (MES) in a passive avoidance step-through paradigm. These N- acylprolyl-containing dipeptides were designed as analogues of pyroglutamyl-containing dipeptides, which we previously demonstrated to be highly active nootropics. Among the ...