(3S,4S,5S)-6-(2-methyl[1,3]dioxolan-2-yl)-7-vinyl-5,6,7,7a-tetrahydropyrrolo[1,2-c]oxazol-3(1H)-one

(4R,5R)-4-Hydroxymethyl-5-vinyl-oxazolidin-2-one

(2S,6S,7R)-(6-acetyl-3-oxo-5,6,7,7a-tetrahydro-1H-pyrrolo[1,2-c]oxazol-7-yl)acetic acid methyl ester

(2S,6S,7S)-7-(2-hydroxyethyl)-6-(2-methyl[1,3]dioxolan-2-yl)-5,6,7,7a-tetrahydropyrrolo[1,2-c]oxazol-3(1H)-one

(3R,4S,5S)-3-acetyl-5-(tert-butyldimethylsilanyloxymethyl)-4-vinylpyrrolidin-2-one