Boc-L-cysteine (Boc-Cys-OH) is a high performance liquid chromatography (HPLC) grade chromatographic solvent Boc-L-cysteine (Boc-Cys-OH) can may be used as a chromatographic solvent, in an experimental study done to study the biosynthesis of S-(3-hexan-1-ol)-glutathione (3MH-S-glut) and S-(3-hexan-l-ol)-L-cysteine (3MH-S-cys), which act as flavour precursors in wines, in Vitis vinifera grapes exposed to various environmental stress.