1 CME S,S-(2-hydroxyethyl)thiocysteine 1.000 2 SCS 3-(ethyldisulfanyl)-L-alanine 0.909 3 0QL 3-[(2-aminoethyl)disulfanyl]-L-alanine 0.833 4 C1S 3-(prop-2-en-1-yldisulfanyl)-L-alanine 0.833 5 EFC S,S-(2-fluoroethyl)thiocysteine 0.833 6 SCH S-methyl-thio-cysteine 0.818 7 BUC S,S-butylthiocysteine 0.769 8 PR3 S,S-propylthiocysteine 0.750 9 6WK (2~{R})-2-azanyl-3-[[(2~{S},3~{S})-2,3-bis(oxidanyl)-4-sulfanyl-butyl]disulfanyl]propanoic acid 0.733 10 CSS S-mercaptocysteine 0.727 11 PEC S,S-pentylthiocysteine 0.714