To furnish direct proof that the peculiar enhancement of catecholaminergic action from the brain in animals dealt with with a little dose of (−)deprenyl is unrelated to MAO inhibition, we designed in the early '90s a relatives of deprenyl analogues devoid in the MAO-B inhibitory effect (Knoll et al copyright https://ppap-hcl98753.techionblog.com/30284851/what-does-ppap-hcl-mean