Using COC(=O)CN1C(=O)c2cc(NS(C)(=O)=O)c(OC)cc2C1=O to produce COc1cc2c(cc1NS(C)(=O)=O)C(=O)N(CC(=O)O)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.