the antiarrhythmic activity similar to that of quinidine ( with ca . 20 times lower toxicity ) was found only for racemic 7-beta-hydroxyethyl-8- ( 1'-hydroxybut-2'-yl ) aminotheophylline 1 and its enantiomers 2 , 3 which did not differ markedly in their efficacy .
C0003195
antiarrhythmic
C0034414
quinidine