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 N-[1-(3-fluoro-4-methoxyphenyl)ethyl]-3-(3-thiophen-3-yl-1,2,4-oxadiazol-5-yl)propanamide .
user
C18H18FN3O3S
assistant