Using O=C1COCCN1c1ccc(N2C[C@H](CCl)OC2=O)cc1, [I-] to produce O=C1COCCN1c1ccc(N2C[C@H](CI)OC2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.