You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1,1-dioxothiolan-3-yl)-3-[(1-ethylpyrrolidin-2-yl)methyl]-2-[(4-nitrophenyl)methyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H29N5O4S
assistant