You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3aS,6aR)-3-(3,5-dimethylphenyl)-5,5-dioxo-3a,4,6,6a-tetrahydrothieno[3,4-d][1,3]thiazol-2-ylidene]pentanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N2O3S2
assistant