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system
For the molecule with diethyl 6-ethyl-5-oxo-1,3,3a,4-tetrahydropentalene-2,2-dicarboxylate as the IUPAC name, what is the corresponding SMILES representation?
user
CCOC(=O)C1(C(=O)OCC)CC2=C(CC)C(=O)CC2C1
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