(2S,3S,4S)-1-tert-butyl 2-methyl 3-(2-methoxy-2-oxoethyl)-4-((R)-1-oxopropan-2-yl)pyrrolidine-1,2-dicarboxylate

Dimethyl (2S,3S,4S)-4-isopropenyl-3-(2-methoxy-2-oxoethyl)pyrrolidine-1,2-dicarboxylate

1-(benzyloxycarbonyl)kainic acid dimethyl ester

methyl-2-((6S,7S,7aS)-3-oxo-6-(prop-1-en-2-yl)hexahydropyrrolo[1,2-c]oxazol-7-yl)acetate

tert-butyl (2S,3S,4S)-3-(2-hydroxyethyl)-2-(hydroxymethyl)-4-(prop-1-en-2-yl)pyrrolidine-1-carboxylate