You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[4-[3-[[4-(2-pyrrolidin-1-ylethoxy)phenyl]methyl]-1-benzothiophen-2-yl]phenoxy]ethylamino]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H34N2O4S
assistant