You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (5S,10bR)-9-chloro-5'-ethyl-2-phenylspiro[1,10b-dihydropyrazolo[1,5-c][1,3]benzoxazine-5,3'-1H-indole]-2'-one into molecular formula.
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C25H20ClN3O2
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