You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethenyl (2S)-2-[[(2S)-3-hydroxy-2-[[(2S)-3-methyl-2-[7-(phenylmethoxycarbonylamino)heptanoylamino]butanoyl]amino]propanoyl]amino]-4-methylpentanoate into molecular formula.
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C31H48N4O8
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