Using O=S(=O)(Cl)Cl, CCOC(=O)Nc1ccc(OC)c(OC)c1C(=O)OCC to produce CCOC(=O)Nc1c(Cl)cc(OC)c(OC)c1C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.