You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-(4-methylsulfonylpiperazin-1-yl)-2-[2-pyrrolidin-1-yl-5-(trifluoromethyl)anilino]ethanone ?
user
C18H25F3N4O3S
assistant