Monothioglycerol CAS 96-27-5 (3-Mercapto-1,2-propanediol / Thioglycerol) Product Introduction Monothioglycerol, also known as 3-mercapto-1,2-propanediol or thioglycerol, is a bifunctional sulfur-containing diol with the formula C3H8O2S. The molecule combines a free thiol group with two hydroxyl groups, giving it unique reducing and solubilizing behavior. Zorui supplies monothioglycerol as a 99% min clear viscous liquid, widely used as an antioxidant, oxygen scavenger and