You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-(4-fluorophenyl)-1-[4-[(4-thiophen-2-yl-1,3-thiazol-2-yl)methyl]piperazin-1-yl]ethanone ?
user
C20H20FN3OS2
assistant