You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[2-(chloromethyl)pyrrolidin-1-yl]ethylamino]-4-[2-(dimethylamino)ethylamino]-5,8-dihydroxy-4a,9a-dihydroanthracene-9,10-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H33ClN4O4
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