英文别名Linagliptin Impurity 51; N-Phthalimide-linagliptin; 1H-Purine-2,6-dione, 7-(2-butyn-1-yl)-8-[(3R)-3-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-1-piperidinyl]-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]; (R)-7-(But-2-ynyl)-8-(3-(1,3-dioxoisoindolin-2-yl)piperidin-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-1H-purine-2,6(3H,7H)-dione; 7-(2-Butyn-1-yl)-8-[(3R)-3-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-1-piperidinyl]-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-1H-purine-2,6-dione; 7-But-2-ynyl-8-[(R)-3-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-piperidin-1-yl]-3-methyl-1-(4-methyl-quinazolin-2-ylmethyl)-3,7-dihydro-purine-2,6-dione 
