S-Alk (en) ylmercaptocysteine (CySSR, R= methyl, ethyl, propyl, 1-propenyl, and allyl), which are the putative metabolites of Allium thiosulfinates, were chemically synthesized. CySSR, but not the corresponding monosulfide species S-alk (en) yl cysteine (CySR), were able to induce quinone reductase (QR, a representative phase II enzyme) in Hepa 1c1c7 cells and inhibit nitric oxide (NO, an inflammatory biomarker) formation in ...