You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[2-(3-fluorophenyl)ethylamino]-6-(pyridin-3-ylmethylamino)pyridin-3-yl]-2-pyridin-3-ylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H25FN6O
assistant