You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[[(3R,5R)-3-amino-6-[[(2S)-2-amino-4-methylpentanoyl]amino]-5-hydroxyhexanoyl]amino]-methylamino]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H31N5O5
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