You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 3-[3-[5-[5-cyano-1-[(2,4-difluorophenyl)methyl]-6-oxo-4-(trifluoromethyl)pyridin-2-yl]thiophen-2-yl]phenyl]propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H19F5N2O3S
assistant