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 4-amino-N-[(4R)-3-amino-4-[(2R)-6-(aminomethyl)-5-hydroxyoxan-2-yl]oxy-5-[5-(hydroxymethyl)oxolan-2-yl]oxycyclohexyl]-3-hydroxybutanamide .
user
C21H40N4O8
assistant