Linagliptin Phthalimide Impurity

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

Synonym: 7-(but-2-yn-1-yl)-8-[(3R)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)piperidin-1-yl]-3-methyl-1-[(4-methylquinazolin-2-yl)methyl]-3,7-dihydro-1H-purine-2,6-dione

Smile: O=C(N(C)C(N=C(N1CCC[C@@H](N2C(C(C=CC=C3)=C3C2=O)=O)C1)N4CC#CC)=C4C5=O)N5CC6=NC7=CC=CC=C7C(C)=N6