Benzyl ((2R,3S)-3-Hydroxy-1,4-bis(phenylthio)butan-2-yl)carbamate is derived from [(1R)-1-(2S)-Oxiranyl-2-(phenylthio)ethyl]-carbamic Acid Phenylmethyl Ester (O847125), which is used in the preparation of HIV protease inhibitor streptolysin, antibacterial Streptococcus. O847125