You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(18-amino-18-oxooctadecanoyl)amino]-8-[2-[2-[2-[2-[2-[(5-ethyl-6-oxoheptyl)amino]-2-oxoethoxy]ethoxy]ethylamino]-2-oxoethoxy]ethoxy]-5-oxooctanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
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