You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(3S,4S,6S)-6-[(2S,4S,5S)-2-[(2S,4S,5S)-3,5-dihydroxy-2-[(5R)-5-hydroxy-2,6-dimethyloxan-3-yl]oxy-6-methyloxan-4-yl]oxy-3,5-dihydroxy-6-methyloxan-4-yl]oxy-4-hydroxy-5-methoxy-2-methyloxan-3-yl]-3-hydroxy-3-methylbutanamide by IUPAC nomenclature, provide its molecular formula.
user
C31H55NO16
assistant