You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2-[(3,5-dichloro-4-methylpyridin-2-yl)amino]-2-oxoethyl] 2-(1,3-dioxoisoindol-2-yl)-4-methylpentanoate by IUPAC nomenclature, provide its molecular formula.
user
C22H21Cl2N3O5
assistant