Using OCCBr, Cn1c(Nc2nc3ccc(Cl)cc3s2)nc2cc(C(=O)N[C@@H]3CCNC3)ccc21 to produce Cn1c(Nc2nc3ccc(Cl)cc3s2)nc2cc(C(=O)N[C@@H]3CCN(CCO)C3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.