You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule methyl 2-[2-[(E)-2-[(Z)-(4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]pent-1-enyl]phenoxy]acetate into molecular formula.
user
C18H19NO4S2
assistant