Using CCCC(=O)C1=C(O)CC2(CCC(C)CC2)OC1=O, CCON to produce CCCC(=NOCC)C1=C(O)CC2(CCC(C)CC2)OC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.