You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]sulfanyl-N-(2-fluorophenyl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H11ClF4N2OS
assistant