Using Cc1cccc(C(=O)N[C@@H](CC(C)C)C(=O)O)c1, NCCO to produce Cc1cccc(C(=O)N[C@@H](CC(C)C)C(=O)NCCO)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.