You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
potassium;5-[[4-[2-(4-methoxyphenyl)-2-oxoethoxy]phenyl]methyl]-1,3-thiazolidin-3-ide-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H16KNO5S
assistant