Using COc1cc(OC)nc(NC(=O)NS(=O)(=O)c2ncccc2C(CCl)OC(C)=O)n1 to produce COc1cc(OC)nc(NC(=O)NS(=O)(=O)c2ncccc2C(O)CCl)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.