the cardiotonic drug milrinone ( 1,6-dihydro-2-methyl-6-oxo- [ 3,4'-bipyridine ] -5-carbonitrile ) is superior to its analogue amrinone ( 5-amino- [ 3,4'-bipyridin ] -6 ( 1h ) -one ) by virtue of its greater potency and reduced side effect profile .
C0128513
milrinone
C0002697
amrinone