(S)-(-)-4-methyl-5-trityloxymethyl-2(5H)-furanone

(2S,3S)-3-Allyl-3-methyl-5-oxo-tetrahydro-furan-2-carboxylic acid

(2S,3R)-(+)-2-hydroxy-3-methylglutaric acid γ-lactone

(S)-4-Methyl-5-trityloxymethyl-dihydro-furan-2-one

(4S,5S)-4-Allyl-5-hydroxymethyl-4-methyl-dihydro-furan-2-one

(2S,3S)-3-Methoxycarbonylmethyl-3-methyl-5-oxo-tetrahydro-furan-2-carboxylic acid

(4S,5S)-5-(hydroxymethyl)-4-methyldihydrofuran-2(3H)-one

(2S,3S)-3-Allyl-3-methyl-5-oxo-tetrahydro-furan-2-carboxylic acid benzyl ester

(1S,3aS,3bS,6aS,6bR)-1-isopropyl-3a-methyl-6-methylenedecahydrocyclobuta[1,2:3,4]di[5]annulene

(4R,5S)-dihydro-5-hydroxymethyl-4-methyl-2(3H)-furanone

3-(2-Methoxycarbonylethyl)-5-((2S,3S)-3-methoxycarbonylmethyl-3-methyl-5-oxotetrahydrofuran-2-yl)formyl-4-methylpyrrole-2-carboxylic acid

3-(2-Methoxycarbonyl-ethyl)-5-((2S,3S)-3-methoxycarbonylmethyl-3-methyl-5-oxo-tetrahydro-furan-2-carbonyl)-4-methyl-1H-pyrrole-2-carboxylic acid tert-butyl ester

5-Formyl-4-(2-methoxycarbonylethyl)-2-((2S,3S)-3-methoxycarbonylmethyl-3-methyl-5-oxotetrahydrofuran-2-yl)formyl-3-methylpyrrole

3-(2-Methoxycarbonyl-ethyl)-4-methyl-5-((3aR,6aS)-3a-methyl-2,5-dioxo-hexahydro-furo[2,3-b]pyrrol-6a-ylmethyl)-1H-pyrrole-2-carboxylic acid tert-butyl ester

(2S,3S)-3-Methoxycarbonylmethyl-3-methyl-5-oxo-tetrahydro-furan-2-carboxylic acid benzyl ester

4-(2-Methoxycarbonylethyl)-2-((2S,3S)-3-methoxycarbonylmethyl-3-methyl-5-oxotetrahydrofuran-2-yl)formyl-3,5-dimethylpyrrole