Using O=CCCl, CCC(O)(CC)c1cccc(Sc2ccc3c(-c4ccccc4)cc(N)nc3c2)c1 to produce CCC(O)(CC)c1cccc(Sc2ccc3c(-c4ccccc4)cc4nccn4c3c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.