A compound selected from the group consisting of racemates of 1-phenoxy-2-hydroxy-3-tert.-butylamino propanes of the formula ##STR1## wherein R is selected from the group consisting of alkynyloxy of 2 to 4 carbon atoms, and R.sub.1 is selected from the group consisting of hydrogen, halogen and alkoxy of 1 to 4 carbon atoms, their optically active isomers and their non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers which compounds possess bradycardia activity and isoproterenol antagonistic activity and also antiarrhythmic activity.
从以下群组中选择的化合物:公式为##STR1##的1-苯氧基-2-羟基-3-叔丁基
氨基
丙烷的外消旋体,其中R从2到4个碳原子的炔氧基中选择,R.sub.1从1到4个碳原子的氢,卤素和烷氧基中选择,它们的光学异构体和所述外消旋体及其光学异构体的无毒、药学可接受的酸盐,这些化合物具有缓慢心率活性和
异丙肾上腺素拮抗活性,还具有抗心律失常活性。