Using c1cc(OCC2CO2)ccc1OCCOCC1CC1, NCCNC(=O)N1CCOCC1 to produce O=C(NCCNCC(O)COc1ccc(OCCOCC2CC2)cc1)N1CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.