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

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

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

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

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