You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule methyl 9-[(2R,3R,4R,5S,6R)-3-acetamido-4-amino-5-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxynonanoate ?
user
C18H34N2O7
assistant