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 2-[2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]ethyl-(3-hydroxybut-3-enyl)amino]acetic acid is given. What is its corresponding molecular formula?
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C16H27N3O9
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