- Metabolism of 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline in human hepatocytes: 2-amino-3-methylimidazo[4,5-f]quinoxaline-8-carboxylic acid is a major detoxification pathway catalyzed by cytochrome P450 1A2. Langouët, S., Welti, D.H., Kerriguy, N., Fay, L.B., Huynh-Ba, T., Markovic, J., Guengerich, F.P., Guillouzo, A., Turesky, R.J. Chem. Res. Toxicol. (2001)