You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(5-fluoropyridin-3-yl)-N-methyl-3-[4-(trifluoromethyl)phenyl]imidazo[1,2-a]pyrazine-6-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H13F4N5O
assistant