You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,4S,5S,6R)-6-methyl-4-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxyoxane-2,3,5-triol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H32O15
assistant