Using CC(C)Nc1ncc2c(n1)CN(C(=O)OC(C)(C)C)CC2=O to produce CC(C)Nc1ncc2c(n1)CN(C(=O)OC(C)(C)C)CC2O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.