Using O=C([O-])[O-], CC(C)(C)OC(=O)N1CCO[C@@H]2Cc3c(ccc(O)c3O)C[C@H]21 to produce CC(C)(C)OC(=O)N1CCO[C@@H]2Cc3c(ccc4c3OCO4)C[C@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.