Using CC(C)(C)OC(=O)N1CCCN(c2cncc([Sn](C)(C)C)c2)CC1, ClI to produce CC(C)(C)OC(=O)N1CCCN(c2cncc(I)c2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.