英文别名7-but-2-ynyl-3-methyl-1-[(4-methylquinazolin-2-yl)methyl]purine-2,6-dione; 7-(2-Butyn-1-yl)-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-1H-purine-2,6-dione; Linagliptin Impurity 29; Linagliptin Des-Piperidine amine; 7-(but-2-yn-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-1H-purine-2,6(3H,7H)-dione; Des(R)-3-Aminopiperidine Linagliptin; Linagliptin impurity Y; Desbromo-Linagliptin; Linagliptin Impurity 10; Linagliptin J 
