(R)-methyl 4-((2S,3R)-3-ethynyloxiran-2-yl)-4-(methoxymethoxy)-2-methylenebutanoate

(4R)-methyl 4-(methoxymethoxy)-2-methylene-4-((2S,3R)-3-vinyloxiran-2-yl)butanoate

(1R,5R,6S)-methyl 5-(methoxymethoxy)-7-oxabicyclo[4.1.0]hept-2-ene-3-carboxylate

(3S,4R,5R)-methyl 3-azido-4-hydroxy-5-(methoxymethoxy)cyclohex-1-enecarboxylate

(1S,5R,6S)-methyl 7-acetyl-5-(methoxymethoxy)-7-azabicyclo[4.1.0]hept-2-ene-3-carboxylate