Using CCOC(=O)Nc1cccc(Cn2nc(-c3ccc(C(=O)O)cc3)ccc2=O)c1, NCCO to produce CCOC(=O)Nc1cccc(Cn2nc(-c3ccc(C(=O)NCCO)cc3)ccc2=O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.