Using CCCC[Sn](CCCC)(CCCC)c1ccnc(SC)n1, CN(C(=O)OC(C)(C)C)c1nccn2c(Br)cnc12 to produce CSc1nccc(-c2cnc3c(N(C)C(=O)OC(C)(C)C)nccn23)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.