You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-piperidin-1-ylsulfonylphenyl)-[4-(2,2,2-trifluoroethyl)piperazin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24F3N3O3S
assistant