You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3R,4R,5S,6R)-2-[(2R,3S,4R,5S)-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-5-[(2R,4S,6S)-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-6-(hydroxymethyl)oxane-3,4-diol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H32O13
assistant