8-[(3R)-3-aminopiperidin-1-yl]-7-but-2-ynyl-3-methyl-1-[(4-methylquinazolin-2-yl)methyl]purine-2,6-dione. Linagliptin inhibits also fibroblast activation protein (FAP)
Linagliptin is a purine and quinazoline derivative that functions as a potentiator of incretin and as long lasting dipeptidyl-peptidase IV inhibitor. It is used as a hypoglycemic agent in the treatment of Type II diabetes mellitus