Using COc1cc2nc(Cl)nc(Cl)c2cc1OC, CCOC(=O)CC(=O)OCC to produce CCOC(=O)C(C(=O)OCC)c1nc(Cl)nc2cc(OC)c(OC)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.