(4'S,5'R,E)-5-(5'-hydroxymethyl-2',2'-dimethyl[1',3']dioxolan-4'-yl)pent-4-enoic acid methyl ester

(4S,5S)-5-((E)-5-methoxy-5-oxopent-1-en-1-yl)-2,2-dimethyl-1,3-dioxolane-4-carboxylic acid

(3aS,6aS,6R,2'R)-5-methoxy-2,2-dimethyl-6-(5'-oxotetrahydrofuran-2'-yl)tetrahydro[1,3]dioxolo[4,5-c]pyrrol-4-one