Using CC(C)(C)NS(=O)(=O)c1cc2c(s1)S(=O)(=O)NCC2O to produce CC(C)(C)NS(=O)(=O)c1cc2c(s1)S(=O)(=O)NCC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.