You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (1R,2R)-5,8-dimethoxy-4-[(Z)-2-(4-methylphenyl)sulfinylethenyl]-1,2-dihydronaphthalene-1,2-diol into molecular formula.
user
C21H22O5S
assistant