英文别名Milrinone Impurity 5; methyl 6-methyl-2-oxo-5-pyridin-4-yl-1H-pyridine-3-carboxylate; Methyl 2-methyl-6-oxo-1,6-dihydro-[3,4'-bipyridine]-5-carboxylate; 1,6-Dihydro-2-methyl-6-oxo-(3,4′-bipyridine)-5-methylformate; Milrinone Impurity Ⅱ; [3,4'-Bipyridine]-5-carboxylic acid, 1,6-dihydro-2-methyl-6-oxo-, methyl ester 
