You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [4,5-dihydroxy-2-[(3,4,5,6-tetrahydroxyoxan-2-yl)methoxy]-6-[[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-3-yl] acetate into its molecular formula.
user
C20H34O17
assistant