A compound is provided that has the formula (II): where R1 in each occurrence is independently H, or C1-C4 alkyl; R2 is a nullity or CH—CH3, R3 is a nullity or C(O)—R6—NH; R6 is C2-C6 alkyl, (CH2CH2—O)n, or (CH(OH)CH2)n; n is an integer of between 1 and 4; R4 is a nullity or NH—R6—C(O); and R5 is a moiety capable of crossing the blood brain barrier and is as a free compound serotonin, dopamine, blood brain barrier (BBB) peptide, membrane translocating peptide, TAT peptides, endocannabinoids 1 & 2, bradykinin, beta-endorphin, bombesin, calcitonin, cholecystokinin, an enkephalin, dynorphin, insulin, gastrin, substance P, neurotensin, glucagon, secretin, somatostatin, motilin, vasopressin, oxytocin, prolactin, thyrotropin, an angiotensin, galanin, neuropeptide Y, thyrotropin-releasing hormone, gonadotropnin-releasing hormone, growth hormone-releasing hormone, luteinizing hormone, vasoactive intestinal peptide transferrin, glucosyl ester, lactic acid, leucine, tryptophan, glutamic acid.