英文别名Linagliptin impurity H; Linagliptin impurity R; 7-(But-2-yn-1-yl)-8-(dimethylamino)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-1H-purine-2,6(3H,7H)-dione; 7-(2-Butyn-1-yl)-8-(dimethylamino)-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-1H-purine-2,6-dione; Linagliptin Imp.K; Linagliptin H; 1H-Purine-2,6-dione, 7-(2-butyn-1-yl)-8-(dimethylamino)-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]- 
