Using O=Cc1cccc(O)c1Br, CC(C)(C)OC(=O)NCCCOS(C)(=O)=O to produce CC(C)(C)OC(=O)NCCCOc1cccc(C=O)c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.