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 (2S,3R)-3-[2-(diaminomethylidenehydrazinylidene)ethyl]-2-[(4-methoxyphenyl)methyl]-4-oxo-1-pyridin-2-ylazetidine-2-carboxylic acid is given. What is its corresponding molecular formula?
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C20H22N6O4
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