Using COc1nc(/C=C/C(=O)OC(C)(C)C)ccc1NC=O, COC(CBr)OC to produce COc1nc(/C=C/C(=O)OC(C)(C)C)ccc1NC(=O)CC(OC)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.