You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-butan-2-yl-N-[1-(4-methylphenyl)-2,5-dioxopyrrolidin-3-yl]cyclopropanecarboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24N2O3
assistant