You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-chloro-N-[(2S)-3-methyl-1-[4-[2-[(5-methyl-1,2-oxazol-3-yl)amino]-2-oxoethyl]piperazin-1-yl]-1-oxobutan-2-yl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H28ClN5O4
assistant