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Linagliptin-2 Boc-Linagliptin N-Boc Linagliptin Linagliptin N-Boc imp N-Des(2-butynyl) 3&rsquo Linagliptin N-Boc Impurity Butanedioicacid,2-ethyl-8-methyl- (R)-tert-butyl (1-(7-(but-2-yn-1-yl)-3-methyl Linagliptin Related Compound B (N-Boc Linagliptin) Carbamic acid, [(3R)-1-[7-(2-butynyl)-2,3,6,7-tetrahydro-3-m... tert-Butyl((3S)-1-(7-(but-2-yn-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)- Tert-butyl((3s)-1-(7-(but-2-yn-1-yl)-3-Methyl-1-((4-Methylquinazolin-2-yl)Methyl)-2,6-dioxo-2,3,4,5, (R)-tert-Butyl (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)carbamate tert-butyl (S)-(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)carbamate tert-butyl (R)-(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)carbamate Tert-butyl((3s)-1-(7-(but-2-yn-1-yl)-3-Methyl-1-((4-Methylquinazolin-2-yl)Methyl)-2,6-dioxo-2,3,4,5,6,7-hexahydro-1h-purin-8-yl)piperidin-3-yl)carbaMate [(3R)-1-[7-(2-Butynyl)-2,3,6,7-tetrahydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-2,6-dioxo-1H-purin-8-yl]-3-piperidinyl]carbamic acid 1,1-dimethylethyl ester Carbamic acid, [(3R)-1-[7-(2-butynyl)-2,3,6,7-tetrahydro-3-methyl-1-[(4-methyl-2-quinaz olinyl)methyl]-2,6-dioxo-1H-purin-8-yl]-3-piperidinyl]-, 1,1-dimethylethyl ester Carbamic acid, N-[(3R)-1-[7-(2-butyn-1-yl)-2,3,6,7-tetrahydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-2,6-dioxo-1H-purin-8-yl]-3-piperidinyl]-, 1,1-dimethylethyl ester Linagliptin impurity 1/Boc-Linagliptin/Tert-butyl((3s)-1-(7-(but-2-yn-1-yl)-3-Methyl-1-((4-Methylquinazolin-2-yl) Methyl)-2,6-dioxo-2,3,4,5,6,7-hexahydro-1h-purin-8-yl)piperidin-3-yl)carbamate