Using CC1=C(CCC(C)C=O)C(C)(C)CCC1, CCOC(=O)CC(=O)OCC to produce CCOC(=O)C(=CC(C)CCC1=C(C)CCCC1(C)C)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.