Using O=C1CCC(=O)O1, NCCc1c[nH]c2ccc([N+](=O)[O-])cc12 to produce COC(=O)Nc1ccc2[nH]cc(CCNC(=O)CCC(=O)O)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.