Using CCC(CC)(c1ccc(O)c(C)c1)c1cc(C)cs1, COC(=O)CBr to produce CCC(CC)(c1ccc(OCC(=O)OC)c(C)c1)c1cc(C)cs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.