You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2R)-2-amino-2-[[(2R)-1-(1-aminoethylideneamino)propan-2-yl]sulfanylmethyl]-3-methylbutanoic acid into molecular formula.
user
C11H23N3O2S
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