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 1-ethyl-3,3,5-trimethyl-2,4-dioxo-1,5-benzodiazepine-7-carbaldehyde;trihydrochloride is given. What is its corresponding molecular formula?
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C15H21Cl3N2O3
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