Linagliptin Dimer Impurity 6

Chemical Name: 1,1'-(((2-Propylpropane-1,3-diyl)bis(quinazoline-4,2-diyl))bis(methylene))bis(8-((R)-3-aminopiperidin-1-yl)-7-(but-2-yn-1-yl)-3-methyl-3,7-dihydro-1H-purine-2,6-dione)

Synonym: 8-[(3R)-3-aminopiperidin-1-yl]-1-{[4-(2-{[2-({8-[(3R)- 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)q uinazolin-4-yl]methyl}pentyl)quinazolin-2-yl]meth yl}-7-(but-2-yn-1-yl)-3-methyl-2,3,6,7-tetrahydro-1 H-purine-2 6-dione