You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[5-amino-1-[[2-(cyclohexylamino)-1-(4-ethylphenyl)-2-oxoethyl]-ethynylamino]-1,5-dioxopentan-2-yl]carbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H40N4O5
assistant