Using C=CCB1OC(C)(C)C(C)(C)O1, CCOC(=O)c1sc2c(c1Br)c(=O)n(C)c(=O)n2C to produce C=CCc1c(C(=O)OCC)sc2c1c(=O)n(C)c(=O)n2C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.