Using CCOC(=O)C[C@@H]1CCc2cc(O)ccc21, CCOC(CBr)OCC to produce CCOC(=O)C[C@@H]1CCc2cc(OCC(OCC)OCC)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.