You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5Z)-3-(2-methoxyphenyl)-5-[(1,2,5-trimethylpyrrol-3-yl)methylidene]-1,3-thiazolidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18N2O3S
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