You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(2S,3R,4S,5S,6R)-2-[(2R,3R,4S,5R,6R)-6-[[(2R,3R,4S,5R,6S)-6-methoxy-3,4,5-tris(phenylmethoxy)oxan-2-yl]methoxy]-4,5-bis(phenylmethoxy)-2-(phenylmethoxymethyl)oxan-3-yl]oxy-3,5-bis(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-4-yl] acetate by IUPAC nomenclature, provide its molecular formula.
user
C84H90O17
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