Using CCC[C@H](C)Oc1nc2nc(OC)nc-2c(N)[nH]1, ClCCCCBr to produce CCC[C@H](C)Oc1nc(N)c2nc(OC)n(CCCCCl)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.