Using Cc1nc2c3c(c(C(=O)O)cc2n1C)CCC(c1ccccc1)O3, NCCO to produce Cc1nc2c3c(c(C(=O)NCCO)cc2n1C)CCC(c1ccccc1)O3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.