You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule ethyl 2-[2-chloro-4-[(E)-[2-(2,3-dichlorophenyl)imino-4-oxo-1,3-thiazolidin-5-ylidene]methyl]-6-methoxyphenoxy]acetate ?
user
C21H17Cl3N2O5S
assistant