You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[4-[2-(2,4-dimethylphenyl)sulfanylacetyl]piperazin-1-yl]sulfonyl-4-methyl-3H-1,3-thiazol-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H23N3O4S3
assistant