Using COC(=O)c1ccc(OC2CCCC2)c2oc(C=O)cc12, O=C(O)CC(=O)O to produce COC(=O)c1ccc(OC2CCCC2)c2oc(/C=C\C(=O)O)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.