benzyl (2R,3S,4R)-4-(2-(benzyloxy)ethyl)-2-formyl-3-hydroxy-3-methyl-5-oxo-2-vinylpyrrolidine-1-carboxylate

benzyl ((3S,4S,5R,6R)-5-(2-(benzyloxy)ethyl)-4-hydroxy-6-methoxy-4-methyl-3-vinyltetrahydro-2H-pyran-3-yl)carbamate

(2R,3S,4R)-dibenzyl 4-(2-(benzyloxy)ethyl)-3-hydroxy-3-methyl-5-oxo-2-vinylpyrrolidine-1,2-dicarboxylate

(2R,3S,4R)-dibenzyl 4-(2-(benzyloxy)ethyl)-3-methyl-5-oxo-3-((trimethylsilyl)oxy)-2-vinylpyrrolidine-1,2-dicarboxylate

(2S,3S,4R)-dibenzyl 4-(2-(benzyloxy)ethyl)-2-formyl-3-methyl-5-oxo-3-((trimethylsilyl)oxy)pyrrolidine-1,2-dicarboxylate