Using CCOC(=O)/C=C/CBr, CCOC(=O)C(C)P(=O)(OCC)OCC to produce CCOC(=O)C=CCC(C)(C(=O)OCC)P(=O)(OCC)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.