You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[2-[3-(aminomethyl)-3-methylpyrrolidin-1-yl]-2-oxoethyl]-5-chlorothiophene-2-sulfonamide into molecular formula.
user
C12H18ClN3O3S2
assistant