You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2S,3R,4R,5S,6R)-2-[(2R,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2-[(3S,4S,5R,6R)-2,3,5-trihydroxy-6-[[(2S,3S,4S,5S,6R)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxymethyl]oxan-4-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H45NO20
assistant