You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-(azepan-1-ium-1-yl)-N-[2-[(5E)-5-[(2-chlorophenyl)methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]ethyl]acetamide into its molecular formula.
user
C20H25ClN3O3S+
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