You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(5-chloropyridin-2-yl)-3-[cyclopropyl-[2-(2,6-dimethylanilino)-2-oxoethyl]amino]propanamide into its molecular formula.
user
C21H25ClN4O2
assistant