You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[(5Z)-5-(1,3-benzodioxol-5-ylmethylidene)-2,4-dioxo-1,3-thiazolidin-3-yl]ethyl]-3-methylbenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H18N2O5S
assistant