Using COc1cc2c(cc1OC)C(=O)CCCC2, COc1cc2c(cc1OC)C(=O)C(C(=O)O)CCC2 to produce COC(=O)C1CCCc2cc(OC)c(OC)cc2C1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.