You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-4-amino-N-[(1R,4R)-5-amino-4-[(2S,5S)-3-amino-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3-[(2S,3S,5R)-5-(azidomethyl)-3,4-dihydroxyoxolan-2-yl]oxy-2-hydroxycyclohexyl]-2-hydroxybutanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H39N7O12
assistant