8-[(3R)-3-aminopiperidin-1-yl]-7-[(2E)-4-hydroxy-3-methylbut-2-en-1-yl]-3-methyl-1-[(4-ethylquinazolin-2-yl)methyl]-3,7-dihydro-1H-purine-2,6-dione,Linagliptin Impurity
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