You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-2-[[(2S,3R)-2-[[(2S)-2-[[(2S,3R)-2-[[2-[[(2S)-2-[[(2S)-2-acetamido-3-hydroxypropanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]acetyl]amino]-3-hydroxybutanoyl]amino]-5-amino-5-oxopentanoyl]amino]-3-hydroxybutanoyl]amino]pentanedioic acid by IUPAC nomenclature, provide its molecular formula.
user
C31H53N11O15
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