You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-6-[(2S,3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]-3-[(2S,3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxychromen-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H30O17
assistant