To furnish direct evidence the peculiar improvement of catecholaminergic action in the brain in animals addressed with a small dose of (−)deprenyl is unrelated to MAO inhibition, we formulated within the early '90s a family of deprenyl analogues devoid with the MAO-B inhibitory effect (Knoll et al In any case, https://ppaphcl55432.digitollblog.com/30060478/not-known-factual-statements-about-ppap-hcl