英文别名Linagliptin Impurity 15; Linagliptin Impurity M; (R)-8-(3-aminopiperidin-1-yl)-7-(but-2-yn-1-yl)-3-methyl-3,7-dihydro-1H-purine-2,6-dione; Linagliptin Impurity C; Linagliptin Impurity 90; 8-[(3R)-3-Amino-1-piperidinyl]-7-(2-butyn-1-yl)-3,7-dihydro-3-methyl-1H-purine-2,6-dione 
