You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (6R)-3-[(E)-3-[5-chloro-2-(2,4-dichlorophenoxy)phenoxy]prop-2-enyl]-5,8-dioxo-7-[(2-thiophen-2-ylacetyl)amino]-5lambda4-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
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C28H21Cl3N2O7S2
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