You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (2S)-2-amino-3-[3,5-diiodo-4-[4-(3-iodo-4-sulfooxyphenoxy)phenoxy]phenyl]propanoic acid is given. What is its corresponding molecular formula?
user
C21H16I3NO8S
assistant