You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(4-chloro-2,5-dimethoxybenzoyl)-5-(3,4-dimethoxyphenyl)-3-hydroxy-1-[(3-methoxyphenyl)methyl]pyrrol-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
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