The effects of feeding p-methoxyphenol, benzyl isothiocyanate, coumarin, a-angelicalactone, 2-fert-butyl-4-hydroxyanisole, and 3-ferf-butyl-4-hydroxyanisole on the glutathione Stransferase activity and sulfhydryl levels of esophagus and small bowel mucosa of ICR/Ha mice have been investigated. p-Methoxyphenol, benzyl isothiocyanate, coumarin, and 2-tertbutyl-4-hydroxyanisole increased glutathio...