You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-[4-[(Z)-[2,4-dioxo-3-(2-phenylethyl)-1,3-thiazolidin-5-ylidene]methyl]phenoxy]acetic acid is given. What is its corresponding molecular formula?
user
C20H17NO5S
assistant