This chiral heterocyclic building block, also known as L-Homoserine lactone hydrochloride, presents as a white to very pale-yellow crystalline powder. Keep container tightly closed and in a cool and dark place. Store under inert gas, protected from moisture as this substance is hygroscopic. (S)-(-)-alpha-Amino-gamma-butyrolactone Hydrochloride is incompatible with oxidizing agents. This chemical causes skin irritation as well as serious eye irritation.