Using O=C1CCC(=O)N1I, O=C1OCc2c1cc1ccc3c(c1c2-c1ccc2c(c1)OCO2)OCO3 to produce O=C1OCc2c1cc1c(I)cc3c(c1c2-c1ccc2c(c1)OCO2)OCO3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.