Synonyms: | Linagliptin impurity KH-3;tert-butyl (R)-(1-(1-(2-((2-acetylphenyl)amino)-2-oxoethyl)-7-(but-2-yn- 1-yl)-3-methyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)piperidin-3- yl)carbamate;(R)-tert-Butyl (1-(1-(2-((2-acetylphenyl)amino)-2-oxoethyl)-7-(but-2-yn-1-yl)-3-methyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)piperidin-3-yl)carbamate (Linagliptin Impurity);Carbamic acid, N-[(3R)-1-[1-[2-[(2-acetylphenyl)amino]-2-oxoethyl]-7-(2-butyn-1-yl)-2,3,6,7-tetrahydro-3-methyl-2,6-dioxo-1H-purin-8-yl]-3-piperidinyl]-, 1,1-dimethylethyl ester |