You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[5-(3-fluorophenyl)-3-(phenylmethoxycarbonylamino)-3,4-dihydropyridin-2-yl] 2-oxobutanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H21FN2O5
assistant