Apixaban Impurity C Catalogue A186733 CAS 503614-91-3 M.W 488.54 M.F C27H28N4O5 Specifications FAQs ethyl 1-(4-methoxyphenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylate