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

(2S,3S)-3-Methoxycarbonylmethyl-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

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