You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-(carbamoylamino)-1-oxopropan-2-yl] (2S)-2-[(4-bromobenzoyl)amino]-3-methylbutanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H20BrN3O5
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