You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-(2-pyrrolidin-1-yl-2-thiophen-2-ylethyl)-3-[1-[3-(trifluoromethyl)phenyl]ethyl]urea is given. What is its corresponding molecular formula?
user
C20H24F3N3OS
assistant