Using NCCC(c1ccc(Cl)cc1)c1nc(N2CCOCC2)sc1C(=O)O to produce O=C1NCCC(c2ccc(Cl)cc2)c2nc(N3CCOCC3)sc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.