Linagliptin Dimer Impurity 5

Chemical Name: 8-((R)-3-aminopiperidin-1-yl)-1-((4-(3-(2-((8-((S)-3-aminopiperidin-1-yl)-7-(but-2-yn-1-yl)-3-methyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-1-yl)methyl)quinazolin-4-yl)-2-(4-methylquinazolin-2-yl)propyl)quinazolin-2-yl)methyl)-7-(but-2-yn-1-yl)-3-methyl-3,7-dihydro-1H-purine-2,6-dione