Using Cc1nc2c(NC(=O)C(C)(C)C)cccn2c1C, CCCC[Sn](Cl)(CCCC)CCCC to produce CCCC[Sn](CCCC)(CCCC)c1ccn2c(C)c(C)nc2c1NC(=O)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.