You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[4-[(4R,5R)-5-[4-(4-fluorophenyl)-4-hydroxybutyl]-3-phenyl-2-sulfanylideneimidazolidin-4-yl]-3-hydroxyphenyl]phenyl]phosphonic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H30FN2O5PS
assistant