Using O=C1CCC(=O)N1Br, Clc1ccc(-c2csc(N3C4CCC3COC4)n2)cc1 to produce Clc1ccc(-c2nc(N3C4CCC3COC4)sc2Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.