You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[(2R,3S,4S,5S,6S)-4,5-dihydroxy-6-(hydroxymethyl)-2-(4-methyl-2-oxochromen-7-yl)oxyoxan-3-yl]acetamide .
user
C18H21NO8
assistant