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-[4-[(2-ethyl-1,3-thiazol-4-yl)methyl]piperazine-1-carbonyl]-4-fluoro-N-propan-2-ylbenzenesulfonamide ?
user
C20H27FN4O3S2
assistant