You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5S)-5-(4-chlorophenyl)-1-[2-(diethylamino)ethyl]-4-[hydroxy-(3-methyl-4-propoxyphenyl)methylidene]pyrrolidine-2,3-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H33ClN2O4
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