Using O=C1CCC(=O)O1, CC1C(C)(C)c2ccccc2C1(C)C to produce CC1C(C)(C)c2ccc(C(=O)CCC(=O)O)cc2C1(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.