Alogliptin Carbamoyl Impurity Catalogue A164502 CAS 1820685-30-0 M.W 357.41 M.F C18H23N5O3 Specifications FAQs 2-[[6-[(3R)-3-Amino-1-piperidinyl]-3,4-dihydro-3-methyl-2,4-dioxo-1(2H)-pyrimidinyl]methyl]benzamide