Using NO, CCOC(=O)CCCCCC(c1ccccc1)c1c(O)ccc2ccccc12 to produce O=C(CCCCCC(c1ccccc1)c1c(O)ccc2ccccc12)NO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.