Linagliptin Dimer Impurity 3

Chemical Name: 8-(3-((1-(2-((8-((R)-3-aminopiperidin-1-yl)-7-(but-2-yn-1-yl)-3,4-dimethyl-2,6-dioxo-2,3,4,5,6,7-hexahydro-1H-purin-1-yl)methyl)quinazolin-4-yl)propan-2-yl)amino)piperidin-1-yl)-7-(but-2-yn-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-3,7-dihydro-1H-purine-2,6-dione