Using O=C1c2ccccc2C(=O)N1CCBr, Nc1nc(S)nc2c1nc(O)n2Cc1ccccc1 to produce Nc1nc(SCCN2C(=O)c3ccccc3C2=O)nc2c1nc(O)n2Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.