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(N(C)C(N=C(N1CC(NCCC2=NC(CN3C(N(C)C(N=C(N4C[C@H](N)CCC4)N5CC#CC)=C5C3=O)=O)=NC6=C2C=CC=C6)CCC1)N7CC#CC)=C7C8=O)N8CC9=NC%10=CC=CC=C%10C(C)=N9