You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(2,4-dimethoxyphenyl)-2-[2-(4-methoxyphenyl)-6,7-dimethyl-4-oxochromen-3-yl]oxyacetamide by IUPAC nomenclature, provide its molecular formula.
user
C28H27NO7
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