You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 5-ethyl-5-[2-fluoro-6-(2-phenylethyl)phenoxy]-1-methylpyrrolidin-3-ol;hydrochloride is given. What is its corresponding molecular formula?
user
C21H27ClFNO2
assistant