Using C=C(c1cccc(C(=O)OC)c1)c1ccc2c(c1)C(C)(C)CCC2(C)C to produce COC(=O)c1cccc(C(C)c2ccc3c(c2)C(C)(C)CCC3(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.