You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(2,3-dihydro-1,4-benzodioxin-6-yl)-2-[(5Z)-5-[(6-nitro-1,3-benzodioxol-5-yl)methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C21H15N3O9S
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