You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-amino-3-methyl-N-[(2S)-1-[[(2S)-1-(4-nitroanilino)-1-oxopropan-2-yl]amino]-1-oxopropan-2-yl]butanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H25N5O5
assistant