You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-[2-(4-methylphenyl)pyrrolidin-1-yl]-1-oxopropan-2-yl]thiophene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H22N2O2S
assistant