Using COc1ccc(-c2nc(C(=O)O)c[nH]2)cc1OC1CCCC1, NCCO to produce COc1ccc(-c2nc(C(=O)NCCO)c[nH]2)cc1OC1CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.