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 (3R,4R,5S,6R)-5-[(2R,3R,4R,5S,6R)-3,4-dihydroxy-6-(methoxymethyl)-5-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(methoxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-(hydroxymethyl)oxane-2,3,4-triol .
user
C20H36O16
assistant