(1R,2S,3R)-4-(hydroxymethyl)-1-[(methoxycarbonyl)amino]2,3-[(dimethylmethylene)dioxy]-4-cyclopentene

methyl (1R,2S,3R)-4-(acetoxymethylene)-2,3-[(dimethylmethylene)dioxy]cyclopentane-1-carboxylate

(1R,2S,3R)-1-[(methoxycarbonyl)amino]-4-[((methoxymethyl)oxy)methyl]-2,3-[(dimethylmethylene)dioxy]-4-cyclopentene

methyl (1R,2S,3S,4R)-2,3-[(dimethylmethylene)dioxy]-4-[((methoxymethyl)oxy)methyl]-4-(phenylseleno)cyclopentane-1-carboxylate

(1R,2S,3S,4R)-2,3-[(dimethylmethylene)dioxy]-4-[((methoxymethyl)oxy)methyl]-1-[(methoxycarbonyl)amino]-4-(phenylseleno)cyclopentane