You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-[5-[3-(2-fluoro-4-isocyano-3-methoxyphenyl)-5,5-dimethyl-4-oxo-2-sulfanylideneimidazolidin-1-yl]pyridin-2-yl]butanenitrile .
user
C22H20FN5O2S
assistant