methyl 4,5-O-ethylpropylidene-3-dehydro-4-epi-shikimate

(1R,2S,3S)-1,2-O-ethylpropylidene-5-(hydroxymethyl)-4-cyclohexene-1,2,3-triol

methyl 3,4-O-ethylpropylidenequinate

methyl 3,4-O-ethylpropylidene-5-dehydroquinate

(1R,2S,3S)-3-O-benzyl-5-(benzyloxymethyl)-1,2-ethylpropylidene-4-cyclohexene-1,2,3-triol