You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[2-[[2-[(2-amino-3-sulfanylpropanoyl)amino]-3-phenylpropanoyl]amino]-3-methylpentanoyl]amino]acetic acid into its molecular formula.
user
C20H30N4O5S
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