Using O=Cc1cc(Cl)cc(Cl)c1, NCCNc1nc(Cl)nc2c1ncn2C1CCCC1 to produce Clc1cc(Cl)cc(CNCCNc2nc(Cl)nc3c2ncn3C2CCCC2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.