Using O=C(Cl)CCl, CCOC(=O)CCNC(C(=O)OCC)C(=O)OCC to produce CCOC(=O)CCN(C(=O)CCl)C(C(=O)OCC)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.