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 tert-butyl N-[(1R,2R)-2-[[(2R)-1-[(3S,5R)-3,5-dimethylpiperidin-1-yl]-1-oxopropan-2-yl]amino]cyclohexyl]carbamate .
user
C21H39N3O3
assistant