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 [(2S,3R,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2-(1,3,6,7-tetrahydroxy-9-oxoxanthen-2-yl)oxan-3-yl] benzoate .
user
C26H22O12
assistant