You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-[(2R)-4-oxo-4-[(1S,3R,4R)-2-(2-phenoxyethyl)-2-azabicyclo[2.2.1]heptan-3-yl]butan-2-yl]benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H31NO4
assistant