This reagent, also known as DAST, presents as a colorless to yellow oil. It is known to be slightly soluble in benzene. Store in a tightly closed container in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage. (Diethylamino)sulfur Trifluoride is incompatible with water and glass. This flammable liquid causes severe skin burns and eye damage.