You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl (2S,5R)-5-amino-2-[(1R)-1-[(2-methylpropan-2-yl)oxy]ethyl]-4-oxohexanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H31NO4
assistant