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 (E)-1-(6-ethyl-2,6-diazaspiro[3.3]heptan-2-yl)-4-morpholin-4-ylbut-2-en-1-one is given. What is its corresponding molecular formula?
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C15H25N3O2
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