7-(but-2-yn-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-8-(3-((3,4,5,6-tetrahydroxy-2-oxohexyl)amino)piperidin-1-yl)-1H-purine-2,6(3H,7H)-dione,Linagliptin Impurity
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