You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (3S)-3-(4-fluorophenyl)-3-(methanesulfonamido)-N-[(1S)-1-phenylethyl]propanamide is given. What is its corresponding molecular formula?
user
C18H21FN2O3S
assistant