You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name N-[2-(1,3-benzodioxol-5-yl)propan-2-yl]-1-(3,5-difluorophenyl)-5-oxopyrrolidine-3-carboxamide ?
user
C21H20F2N2O4
assistant