Using CC(C)(C)OC(=O)n1ccc2c3c(ccc21)NC(C(=O)O)C3, O=[N+]([O-])c1ccc(CCO)cc1 to produce CC(C)(C)OC(=O)n1ccc2c3c(ccc21)NC(C(=O)OCCc1ccc([N+](=O)[O-])cc1)C3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.