You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(E)-(3-methyl-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]-N-[5-(2-methylpropyl)-1,3,4-thiadiazol-2-yl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18N4O2S3
assistant