You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[5-[(2-chlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-5-(4-hydroxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H19ClN4O5S2
assistant