You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[(2S)-3-[(2R)-2-(4-chlorophenyl)morpholin-4-yl]-2-hydroxypropoxy]phenyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H25ClN2O4
assistant