[Effect of 1,2,3,4-tetrahydroimidazo[4,5-c]pyridine and 1,2,3,4-tetrahydroisoquinoline derivatives on the behavior and the brain receptor system in rats].

Adducts obtained via the interaction of formaldehyde with histidine (1,2,3,4-tetrahydroimidazo[4, 5-c]pyridine-3-carboxylic acid (I)), tyrosine (7-hydroxy-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid (II)), and dopamine (6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (III)) influence the behavior and the state of the brain receptor system of rats upon chronic administration (10-day treatment at a daily dose of 50 mg/kg, i.p.).