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 methyl 2-[(5Z)-5-[[1-(3,4-dimethylphenyl)-2,5-dimethylpyrrol-3-yl]methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]acetate ?
user
C21H22N2O4S
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