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 1-[(3R)-1,1-dioxothiolan-3-yl]-3-(3-fluoro-4-methylphenyl)-1-(pyridin-3-ylmethyl)thiourea ?
user
C18H20FN3O2S2
assistant