Using Cc1cn(C(=O)OC(C)(C)C)c2c(Cl)ncc(I)c12, O=C=O to produce Cc1cn(C(=O)OC(C)(C)C)c2c(Cl)ncc(C(=O)O)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.