1 266 2-(propylsulfanyl)ethanol 1.000 2 X79 (prop-2-ynylthio)acetic acid 0.875 3 X7Q (allylthio)acetic acid 0.875 4 YBX (ethylsulfanyl)acetic acid 0.750 5 OCY Hydroxyethylcysteine 0.700 6 SWW (2~{S})-2-azanyl-3-(2-hydroxyethylsulfanyl)propanoic acid 0.700