You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (4R,5R)-1-(4-chlorophenyl)-4-pyridin-2-yl-5-(1-pyridin-2-ylpyrrol-2-yl)imidazolidine-2-thione ?
user
C23H18ClN5S
assistant