Using NCCOCCO, CC(C)(C)OC(=O)n1c(-c2ccc(Cl)c3c2C(=O)NC3)cc2cc(C=O)ccc21 to produce CC(C)(C)OC(=O)n1c(-c2ccc(Cl)c3c2C(=O)NC3)cc2cc(CNCCOCCO)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.