Using CCOC(=O)c1nc(-c2ccc3c(c2)N(C(=O)OC(C)(C)C)CCC3)sc1CCCCl, [I-] to produce CCOC(=O)c1nc(-c2ccc3c(c2)N(C(=O)OC(C)(C)C)CCC3)sc1CCCI, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.