You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (2S)-2-[[(2R)-2-[[(2R)-2-[(2-aminoacetyl)amino]-3-phenylpropanoyl]amino]propanoyl]amino]butanedioic acid is given. What is its corresponding molecular formula?
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C18H24N4O7
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