You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(5Z)-5-[(3,4-dimethoxyphenyl)methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]-N-[5-[(4-methylphenyl)methyl]-1,3-thiazol-2-yl]butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H27N3O4S3
assistant