Using NC(=O)c1cc(OCCN(Cc2ccccc2)CC(O)c2ccccc2)ccc1O to produce NC(=O)c1cc(OCCNCC(O)c2ccccc2)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.