You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S,5S)-5-[5-(4-bromophenyl)furan-2-yl]-1-(2-hydroxyethyl)-4-pyridin-2-ylimidazolidine-2-thione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H18BrN3O2S
assistant