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-[4-[2-[2-[2-[2-[2-[butyl(carboxymethyl)amino]ethoxy]ethoxy]ethoxy]ethylamino]-2-oxoethyl]-7,10-bis(carboxymethyl)-1,4,7,10-tetrazacyclododec-1-yl]acetic acid is given. What is its corresponding molecular formula?
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C30H56N6O12
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