You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-5,7-dihydroxy-6-[(2S,3R)-7-hydroxy-2-(4-hydroxyphenyl)-4-oxo-2,3-dihydrochromen-3-yl]-2-(4-hydroxyphenyl)-2,3-dihydrochromen-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C30H22O9
assistant