You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[3-(diphosphanylamino)-2-[3-(4-methoxyphenyl)propanoylamino]-3-oxopropyl]phenyl] acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26N2O5P2
assistant