Using CC(C)(C)OC(=O)N1CCN(CC(O)c2ccc3c(c2)COC3=O)[C@H](CO)C1 to produce CC(C)(C)OC(=O)N1CCN2CC(c3ccc4c(c3)COC4=O)OC[C@@H]2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.