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 3-[3-[(3S,4S)-3-hydroxy-4-phenylpiperidin-1-yl]-3-oxopropyl]-1H-pyridazin-6-one is given. What is its corresponding molecular formula?
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C18H21N3O3
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