7-(丁-2-炔-1-基)-8-乙氧基-3-甲基-1-((4-甲基喹唑啉-2-基)甲基)-1H-嘌呤-2，6-(3H，7H)-二酮(利格列汀杂质)

7-(丁-2-炔-1-基)-8-乙氧基-3-甲基-1-((4-甲基喹唑啉-2-基)甲基)-1H-嘌呤-2，6-(3H，7H)-二酮(利格列汀杂质)

7-(But-2-yn-1-yl)-8-ethoxy-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-1H-purine-2，6(3H，7H)-dione(LinagliptinImpurity)