<unk>  is the N-acetyl derivative of the amino acid L-cysteine, and is a precursor in the formation of the antioxidant glutathione in the body. The thiol (sulfhydryl) group confers antioxidant effects and is able to reduce free radicals. N-acetyl-L-cysteine is soluble in water and alcohol, and practically insoluble in chloroform and ether. It is a white to white with light yellow cast powder, and has a pKa of 9.5 at 30 °C.
Acetylcysteine
Fomepizole
Sodium bicarbonate
Disufenton sodium
Malaoxon
Sodium thiosulfate 
Physostigmine
Cyanocobalamin