Using COc1cc(O)cc(OC)c1, COC1=C(OC)C(=O)C2=C(CCC(CCO)CC2)C1=O to produce COC1=C(OC)C(=O)C2=C(CCC(CCOc3cc(OC)cc(OC)c3)CC2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.