(1R,2S,3R,4R)-4-(acetoxymethyl)-2,3-[(dimethylmethylene)dioxy]-cyclopentane-1-carboxamide

(1R,2S,3R,4S)-2,3-isopropylidenedioxy-4-(1'-methoxycarbonyl-1'-oxomethyl)cyclopentane-1-carboxylic acid

(1R,2S,3R,4R)-4-(acetoxymethyl)-1-[(tert-butoxycarbonyl)amino]-2,3-[(dimethylmethylene)dioxy]-cyclopentane

(4R,5R)-1-(2,2-dimethyl-5-vinyl-[1,3]dioxolan-4-yl)prop-2-en-1-ol