(1S)-N-(1-cyano-2-isopropylcyclopent-2-en-1-yl)-P,P-diphenylphosphinic amide

1-tert-butyl 2-ethyl (2S)-2-[(1S)-1-(acetyloxy)-2-methylpropyl]-5-oxopyrrolidine-1,2-dicarboxylate

1-tert-butyl 2-ethyl (2S,3S)-2-[(1S)-1-(acetyloxy)-2-methylpropyl]-3-hydroxy-5-oxopyrrolidine-1,2-dicarboxylate

1-tert-butyl 2-ethyl (2S,3S,4R)-2-[(1S)-1-(acetyloxy)-2-methylpropyl]-3-hydroxy-4-methyl-5-oxopyrrolidine-1,2-dicarboxylate

(3R,4S,5R,1'S)-4-acetoxy-5-(1'-acetoxy-2'-methylpropyl)-5-hydroxymethyl-3-methylpyrrolidin-2-one