You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-(3-acetylphenyl)-5,5-dioxo-3a,4,6,6a-tetrahydrothieno[3,4-d][1,3]thiazol-2-ylidene]cyclohexanecarboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24N2O4S2
assistant