Using CCOC=O, CCOC(=O)Cc1c(C(=O)OCC)ccn1Cc1ccc(OC)cc1 to produce CCOC(=O)C(=CO)c1c(C(=O)OCC)ccn1Cc1ccc(OC)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.