Linagliptin Ether Impurity Catalogue L562368 M.W 474.56 M.F C25H30N8O2 Specifications FAQs 8-((R)-3-Aminopiperidin-1-yl)-7-(but-2-ynyl)-3-methyl-2-((4-methylquinazolin-2-yl)methoxy)-2,3-dihydro-1H-purin-6(7H)-one
