You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule benzhydryl (6R,7R)-7-[(4-chloro-3-oxobutanoyl)amino]-3-ethenyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate into molecular formula.
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C26H23ClN2O5S
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