Using COC(=O)COc1c(CCC(C)C)c(OC)cc(OC)c1C(=O)CCc1ccc(OC)c(O)c1 to produce COc1ccc(CCC(=O)c2c(OC)cc(OC)c(CCC(C)C)c2OCC(=O)O)cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.