You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[5-[1-[(2-chlorophenyl)methyl]-2-oxoindol-3-ylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]-2-methylbenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H18ClN3O3S2
assistant