Using CCCn1c(=O)c2[nH]c(C34CCC(C=O)(CC3)CC4)nc2n(CCC)c1=O, NO to produce CCCn1c(=O)c2[nH]c(C34CCC(C=NO)(CC3)CC4)nc2n(CCC)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.