You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule methyl 2-[3-[3-[3-[(3-hydroxy-2-oxopropyl)-methylamino]-3-oxopropyl]phenyl]propanoyl-methylamino]acetate into molecular formula.
user
C20H28N2O6
assistant