You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[1-[3-(ethylamino)propyl]-5-hydroxyindol-3-yl]-4-(5-hydroxy-1H-indol-3-yl)pyrrole-2,5-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H24N4O4
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