Linagliptin Regio Isomer

Chemical Name: (R)-7-(but-2-yn-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-8-(piperidin-3-ylamino)-3,7-dihydro-1H-purine-2,6-dione; Des-(R)-piperidin-3-amine 8-(R)-(Piperidin-3-ylamino) Linagliptin;

Synonym: Linagliptin Impurity 27;Linagliptin impurity E