Linagliptin Dimer Impurity 4

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

Smile: O=C(N1CC2=NC(C[C@@H](N[C@H]3CN(C(N4CC#CC)=NC(N(C)C(N5CC6=NC(C)=C7C=CC=CC7=N6)=O)=C4C5=O)CCC3)C)=C8C=CC=CC8=N2)N(C)C9=C(N(CC#CC)C(N%10C[C@H](N)CCC%10)=N9)C1=O