1-(tert-butyl) 2-methyl (2S,3S,4S)-3-(2-methoxy-2-oxoethyl)-4-(4-oxo-3-(phenylselanyl)butan-2-yl)pyrrolidine-1,2-dicarboxylate

1-(tert-butyl) 2-methyl (2S,3S,4S)-3-(2-methoxy-2-oxoethyl)-4-((Z)-4-oxobut-2-en-2-yl)pyrrolidine-1,2-dicarboxylate

tert-butyl (3S,4S,5S)-3-((S)-1-(1,3-dioxolan-2-yl)ethyl)-5-(((tert-butyldimethylsilyl)oxy)methyl)-4-(2-methoxy-2-oxoethyl)-2-oxopyrrolidine-1-carboxylate

(R,3E,5Z)-6-((3S,4S,5S)-1-(tert-butoxycarbonyl)-4-(2-methoxy-2-oxoethyl)-5-(methoxycarbonyl)pyrrolidin-3-yl)-2-methylhepta-3,5-dienoic acid

1-(tert-butyl) 2-methyl (2S,3S,4S)-4-((R,2Z,4E)-7-hydroxy-6-methylhepta-2,4-dien-2-yl)-3-(2-methoxy-2-oxoethyl)pyrrolidine-1,2-dicarboxylate