Using O=C1CCC(=O)O1, Cc1ncc([N+](=O)[O-])n1CCO to produce Cc1ncc([N+](=O)[O-])n1CCOC(=O)CCC(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.