You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[(4R,5S)-5-(5-chlorothiophen-2-yl)-4-pyridin-2-yl-2-sulfanylideneimidazolidin-1-yl]-2-methylphenyl]-2-methoxyacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H21ClN4O2S2
assistant