Linagliptin Impurity 4

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

Smile: O=C(N(C)C(N=C(N1CCC[C@@H](NCC2=NC(C=CC=C3)=C3C(C)=N2)C1)N4CC#CC)=C4C5=O)N5CC6=NC7=CC=CC=C7C(C)=N6