You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (2S)-2-amino-1-[3-[3-(4-chlorophenyl)-1,2,4-oxadiazol-5-yl]piperidin-1-yl]-3,3-dimethylbutan-1-one;hydrochloride by IUPAC nomenclature, provide its molecular formula.
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C19H26Cl2N4O2
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