(R-N=C=S) or mustard oils; produce the pungent and acrid flavor, biting taste and odor of mustard, horseradish and cruciferae vegetables.

Among the most effective cancer-prevention agents known. These organosulfur compounds boost the cancer-fighting power of certain enzymes. One, sulphorophane, appears to be especially potent. They are partially responsible for the pungency of some cruciferous vegetables.

Cruciferous vegetables contain phytochemical indoles and isothiocyanates that have anti-cancer properties.