You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 7-chloro-5-phenylspiro[1H-1,4-benzodiazepine-3,4'-piperidine]-2-one;hydrochloride is given. What is its corresponding molecular formula?
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C19H19Cl2N3O
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