You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 3-thiophen-3-yl-1-[4-[4-(trifluoromethyl)phenyl]sulfonylpiperazin-1-yl]propan-1-one ?
user
C18H19F3N2O3S2
assistant