You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-(3-bromo-5-methylpyridin-2-yl)-3-[[1-(4-fluorophenyl)cyclohexyl]methyl]thiourea is given. What is its corresponding molecular formula?
user
C20H23BrFN3S
assistant