You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(4-methoxyphenyl)-1-[4-[(1S,2R)-2-thiophen-2-ylcyclopropanecarbonyl]piperazin-1-yl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N2O3S
assistant