You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named [2-[(3-fluoro-4-methylphenyl)methyl]phenyl]-[(6R)-6-(hydroxymethyl)-1,4-oxazepan-4-yl]methanone is given. What is its corresponding molecular formula?
user
C21H24FNO3
assistant