You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Can you give the molecular formula of the molecule (3aR,6aS)-N-[[5-cyclopropyl-3-(2,6-dichlorophenyl)-1,2-oxazol-4-yl]methyl]-1,2,3,3a,4,5,6,6a-octahydrocyclopenta[c]pyrrol-5-amine ?
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C20H23Cl2N3O
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