3-(2-Allyloxycarbonyl-ethyl)-4-methyl-5-[3-methyl-5-oxo-4-[2-(toluene-4-sulfinyl)-ethyl]-1,5-dihydro-pyrrol-(2Z)-ylidenemethyl]-1H-pyrrole-2-carboxylic acid tert-butyl ester

3-(2-Allyloxycarbonyl-ethyl)-4-methyl-5-[4-methyl-3-octyl-5-oxo-1,5-dihydro-pyrrol-(2Z)-ylidenemethyl]-1H-pyrrole-2-carboxylic acid tert-butyl ester

3-(2-allyloxycarbonyl-ethyl)-5-(3-ethyl-4-methyl-5-oxo-1,5-dihydro-pyrrol-2-ylidenemethyl)-4-methyl-1H-pyrrole-2-carboxylic acid tert-butyl ester

5-[4-[2-(allyloxycarbonyl)ethyl]-5-t-butoxycarbonyl-3-methyl-2-pyrrolylmethylene]-1,5-dihydro-4-(1-methoxyethyl)-3-methyl-2H-pyrrol-2-one