You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [2-[1-(4-chlorophenyl)ethyl]-3-(4-fluorothiophen-2-yl)-4,5-dimethyl-3H-pyrazol-1-yl] formate .
user
C18H18ClFN2O2S
assistant