Using O=c1[nH]c(-c2ccc(Cl)cc2)co1, CCOC(=O)C(=O)Cl to produce CCOC(=O)C(=O)c1oc(=O)[nH]c1-c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.