Linagliptin Impurity 31

Chemical Name: (R)-N-(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)pivalamide

Smile: CC(C)(C)C(N[C@H]1CN(C(N2CC#CC)=NC(N(C)C(N3CC4=NC(C)=C5C=CC=CC5=N4)=O)=C2C3=O)CCC1)=O