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 [(2R,4aR,8aR)-1,2,3,4,4a,5,6,7,8,8a-decahydronaphthalen-2-yl]-[(3S)-3-[(5-methyl-1,2,4-oxadiazol-3-yl)methyl]piperidin-1-yl]methanone is given. What is its corresponding molecular formula?
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C20H31N3O2
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