You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(Z)-[4-[(2S)-butan-2-yl]oxy-3-iodo-5-methoxyphenyl]methylideneamino]-2-(4-chlorophenyl)sulfanylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22ClIN2O3S
assistant