Using O=C(NC1CCNC1)C1=Cc2cnc3cccc(n23)S1, BrCCCc1ccccc1 to produce O=C(NC1CCN(CCCc2ccccc2)C1)C1=Cc2cnc3cccc(n23)S1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.