5-[tert-Butoxycarbonyl-(3-ethyl-4-methyl-5-oxo-5H-pyrrol-2-ylsulfanyl)-methyl]-3-(2-methoxycarbonyl-ethyl)-4-methyl-1H-pyrrole-2-carboxylic acid tert-butyl ester

tert-Butyl α-(Triphenylphosphoranylidene)-α-(5-(tert-butoxycarbonyl)-4-(2'-(methoxycarbonyl)ethyl)-3-methylpyrrol-2-yl)acetate

methyl (Z)-2-(t-butoxycarbonyl)-4-methyl-5-<3-methyl-5-oxo-4-(2-tosylethyl)-1,5-dihydro-2H-pyrrol-2-ylidene>methylpyrrole-3-propionate

5'-(tert-butoxycarbonyl)-3-ethyl-4'-(2-methoxycarbonylethyl)-3',4-dimethyl-2,2'-dipyrrylmethane-5-carboxylic acid

3-(5-{Allyloxycarbonyl-[3-eth-(E)-ylidene-4-methyl-5-oxo-pyrrolidin-(2E)-ylidene]-methyl}-2-formyl-4-methyl-1H-pyrrol-3-yl)-propionic acid methyl ester