(R)-N-(1-(7-(бутил-2-ин-1-基)-3-метил-1-((4-метил喹唑啉-2-基)метил)-2，6-二кислорода代-2-，3，6，7-四водорода-1H-пурин-8-基)哌啶-3-基)метиламид(利格列汀примесь)
(R)-N-(1-(7-(But-2-Yn-1-Yl)-3-Methyl-1-((4-Methylquinazolin-2-Yl)Methyl)-2，6-Dioxo-2，3，6，7-Tetrahydro-1H-Purin-8-Yl)Piperidin-3-Yl)Formamide (Linagliptin Impurity)
(R)-N-(1-(7-(But-2-Yn-1-Yl)-3-Methyl-1-((4-Methylquinazolin-2-Yl)Methyl)-2，6-Dioxo-2，3，6，7-Tetrahydro-1H-Purin-8-Yl)Piperidin-3-Yl)Formamide (Linagliptin Impurity) 98%