Using CCOC(=O)c1ccc(OC(=O)c2ccc3c(c2)C(O)(C(=O)OCC)CCC3(C)C)cc1 to produce CCOC(=O)C1=CCC(C)(C)c2ccc(C(=O)Oc3ccc(C(=O)OCC)cc3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.