You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-1-[(4-methylphenyl)methylamino]-1-oxopropan-2-yl] 2-[2-(2-oxopyrrolidin-1-yl)-1,3-thiazol-4-yl]acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23N3O4S
assistant