You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-amino-4-methylpentanoyl]amino]propanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-4-methylpentanoyl]amino]-4-methylpentanoyl]amino]butanedioic acid .
user
C31H57N9O9
assistant