You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2R,3R,4R,5S,6R)-2-amino-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl]-N-methylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C9H18N2O5
assistant