Using CC(C)(C)OC(=O)Cn1cc(Br)c2cncnc21, C=C(OCC)[Sn](CCCC)(CCCC)CCCC to produce CC(=O)c1cn(CC(=O)OC(C)(C)C)c2ncncc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.