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 (2S,3S,4S,5R,6R)-6-[(2S,3R,4S,5S,6R)-2-[(2R,3S,4R,5R,6S)-6-acetamido-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid .
user
C20H33NO17
assistant