You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-[[2-[(2-aminoacetyl)amino]-3-hydroxypropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]pentanedioic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C19H26N4O9
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