8-[(3R)-3-Amino-1-piperidinyl]-7-(2-butyn-1-yl)-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-1H-purine-2,6-dione-13C,D3; (R)-8-(3-aminopiperidin-1-yl)-7-(but-2-yn-1-yl-4-13C-4,4,4-D3)-3-methyl-1-((5-methylquinazolin-2-yl)methyl)-3,7-dihydro-1H-purine-2,6-dione;Linagliptin-13C-D3
8-[(3R)-3-Amino-1-piperidinyl]-7-(2-butyn-1-yl)-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-1H-purine-2,6-dione-13C,D3; (R)-8-(3-aminopiperidin-1-yl)-7-(but-2-yn-1-yl-4-13C-4,4,4-D3)-3-methyl-1-((5-methylquinazolin-2-yl)methyl)-3,7-dihydro-1H-purine-2,6-dione;Linagliptin-13C-D3