You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-(4-hydroxyphenyl)-8-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]-7-(3,4,5-trihydroxyoxan-2-yl)oxychromen-4-one .
user
C26H28O13
assistant