You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 1-(1,1-difluoro-2-oxo-2-piperidin-1-ylethyl)benzo[h]isoquinoline-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H22F2N2O3
assistant