You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[(5E)-5-[[1-(4-hydroxyphenyl)pyrrol-2-yl]methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H16N2O5S
assistant