1 E9N (2~{R})-2-(phenylmethylsulfanyl)butanedioic acid 1.000 2 DZK (2~{S})-2-(phenylmethylsulfanyl)butanedioic acid 1.000 3 BCS Benzylcysteine 0.765 4 YRV S-[(3-methylphenyl)methyl]-L-cysteine 0.722 5 ZBZ S-(phenylcarbonyl)-L-cysteine 0.722