You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1S)-1-(4-methylphenyl)propyl]-2-(4-thiophen-2-ylsulfonylpiperazin-1-yl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H27N3O3S2
assistant