You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name tert-butyl (3S)-3-[[2-chloro-5-[(2-fluoro-6-methylanilino)methyl]pyridin-4-yl]amino]pyrrolidine-1-carboxylate into its molecular formula.
user
C22H28ClFN4O2
assistant