An intracerebroventricular injection of d-coclaurine (50 micrograms), a benzyltetrahydroisoquinoline alkaloid extracted from Magnolia salicifolia, produced a slight increase in 3,4-dihydroxyphenylacetic acid level and a significant increase in homovanillic acid level in the mouse striatum. Another
(+/-)-Higenamine (Hig. demethylcoclaurine) is a cardiotonic principle from aconite root. (+)-R-Coclaurine (Coc) and (+)-S-reticuline (Ret) are compounds contained in the dried buds of Magnolia salicifolia MAXIM. All of these alkaloids possess a common chemical structure: tetrahydroisoquinoline. Coc