Most nitrolic acids are laboratory curiosities.  One exception is the compound HOC(CH)C(NO)=NOH, which is produced by the oxidation of cyclohexanone with nitric acid. This species decomposes to adipic acid and nitrous oxide:
:HOC(CH)C(NO)=NOH  →  HOC(CH)COH  +  NO
This conversion is thought to be the largest anthropogenic route to NO, which, on a molecule-to-molecule basis, has 298 times the atmospheric heat-trapping ability of carbon dioxide. Adipic acid is a precursor to many nylon polymers. In the end, nitrous oxide is produced in about one to one mole ratio to the adipic acid.