You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-[[2-[(2-amino-4-methylpentanoyl)amino]acetyl]amino]-4-[[1-carboxy-2-(4-hydroxyphenyl)ethyl]amino]-4-oxobutanoic acid into its molecular formula.
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C21H30N4O8
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