You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-chloro-2-(4-ethoxyphenyl)-1-(4-propan-2-ylphenyl)-1H-chromeno[2,3-c]pyrrole-3,9-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H24ClNO4
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