You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-[2-[2-[4-(4-ethoxy-3-phenylanilino)phenyl]ethylamino]-1-hydroxyethyl]-8-hydroxy-1H-quinolin-2-one by IUPAC nomenclature, provide its molecular formula.
user
C33H33N3O4
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