You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[1-[[1-(2,3-dimethylphenyl)-2-oxo-2-(propan-2-ylamino)ethyl]-ethylamino]-3-methyl-1-oxopentan-2-yl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H43N3O4
assistant