the antiarrhythmic effects of amitriptyline ( 1 ) , its secondary amine metabolite nortriptyline ( 2 ) , as well as cyclobenzaprine ( 3 ) and cyproheptadine ( 4 ) , tertiary amine analogues of 1 , were studied in conscious dogs 24 h after myocardial infarction .
C0002600
amitriptyline
C0028420
nortriptyline