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