You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(5Z)-5-[(3,4-dimethoxyphenyl)methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]-N-pyridin-2-ylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H17N3O4S2
assistant