You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[4-ethyl-3-[6-methoxy-2-(4-methoxyphenyl)-1-benzofuran-3-yl]phenoxy]ethyl]piperidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H35NO4
assistant