Using CCOC(=O)CCl, COCCn1c(-c2ccc(Cl)cc2)n[nH]c1=O to produce CCOC(=O)Cn1nc(-c2ccc(Cl)cc2)n(CCOC)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.