Using C[C@]12CC[C@H](O)CC1CC[C@@H]1[C@@H]2CC[C@]2(C)C3OCCOC3C[C@@H]12, CCOC(CBr)OCC to produce CCOC(CO[C@H]1CC[C@@]2(C)C(CC[C@@H]3[C@@H]2CC[C@]2(C)C4OCCOC4C[C@@H]32)C1)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.