2-[[(E)-6-(2,4-dichlorophenyl)hex-5-enyl]sulfanylmethyl]-2-hydroxybutanedioic acid 2-[[(E)-6-(2,4-dichlorophenyl)hex-5-enyl]sulfanylmethyl]-2-hydroxy-butanedioic acid 2-[[[(E)-6-(2,4-dichlorophenyl)hex-5-enyl]thio]methyl]-2-hydroxybutanedioic acid 2-[[[(E)-6-(2,4-dichlorophenyl)hex-5-enyl]thio]methyl]-2-hydroxy-succinic acid