in 13 healthy volunteers , ergometric examinations in the supine position after intake of 2 x 40 mg/d ( - ) -1- ( tert.-butyl-amino ) -3- ( o-cyclopentylphenoxy ) -2-propanol ( penbutolol , betapressin ) , a new beta-adrenergic receptor blocking substance , or 3 x 60 mg/d n- ( 3,3-diphenylpropyl ) -alpha-methyl-phenethylamine ( prenylamine , segontin ) showed no alteration of the exercise tolerance compared to controls .
C0031399
phenethylamine
C0033059
prenylamine