7-{(1R,2R)-2-[3-(4-Nitro-phenyl)-propylamino]-cyclopentyl}-heptanoic acid methyl ester
7-{(1S,2R)-2-[3-(4-Nitro-phenyl)-propylamino]-cyclopentyl}-heptanoic acid methyl ester
2-(6-methoxycarbonylhexyl)cyclopent-2-en-1-one
Methyl 7-(2-oxocyclopentylidene)-heptanoate
5-bromo-2-(6'-methoxycarbonylhexyl)cyclopent-2-en-1-one