You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 5-[2-(2-chloro-4-fluorobenzoyl)-5-methylphenyl]-1-methyl-4-[(1S)-1-(sulfanylamino)ethyl]pyridin-2-one ?
user
C22H20ClFN2O2S
assistant