You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2R,3R,4R,5R,6S)-6-[2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-oxochromen-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H20O13
assistant