(+)-(S)-2-Hydroxy-2-methyl-4-(2,4,5-trimethyl-3,6-dioxocyclohexa-1,4-dien-1-yl)butansaeure

(S)-4-(2,5-Dimethoxy-3,4,6-trimethylphenyl)-2-methyl-1-(4-tolylsulfonyloxy)butan-2-ol

(2S)-4-(2,5-Dimethoxy-3,4,6-trimethylphenyl)-2-hydroxy-2-methylbutansaeure-((1S)-1-(benzylcarbamoyl)-ethyl)ester