You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-nitro-5-[(4-pyrrolidin-1-ylsulfonylphenyl)methylamino]thiophen-2-yl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H19N3O5S2
assistant