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 (5Z)-2-(4-methoxyphenyl)imino-5-[(5-nitro-2-pyrrolidin-1-ylphenyl)methylidene]-1,3-thiazolidin-4-one .
user
C21H20N4O4S
assistant