Using COCCBr, CC(C)(C)NS(=O)(=O)c1cc2c(s1)S(=O)(=O)NCC2O to produce COCCN1CC(O)c2cc(S(=O)(=O)NC(C)(C)C)sc2S1(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.