(S)-8-(3-aMinopiperidin-1-yl)-7-(but-2-ynyl)-3-Methyl-1-((4-Methylquinazolin-2-yl)Methyl)-1H-purine-2,6(3H,7H)-dione

8-Bromo-3-methyl-1,7-bis((4-methylquinazolin-2-yl)methyl)-1H-purine-2,6(3H,7H)-dione is an impurity of Linagliptin (L465900), a novel potent and selective dipeptidyl peptidase-4 (DPP-4) inhibitor with potential use in the treatment of type 2 diabetes.