Rhodium, what beta-hydroxy-phenethylamines are active, if I might be so bold and ask?
I'm thinking ephedrine, which is merely active in the peripheric nervous system (yet it is probably more lipophilic than most beta-OH-PEA's), and its keto-analog CAT which is slightly more active in the CNS.
What beta-hydroxy-PEA's are you thinking about when stating that beta-OH-PEA's are CNS-active?