2-[cyclopentyl-(3,5-dichloro-2-sulfanylbenzoyl)amino]acetic acid 2-[cyclopentyl-(3,5-dichloro-2-sulfanyl-benzoyl)amino]acetic acid 2-[cyclopentyl-[(3,5-dichloro-2-mercaptophenyl)-oxomethyl]amino]acetic acid 2-[cyclopentyl-(3,5-dichloro-2-mercapto-benzoyl)amino]acetic acid 2-[cyclopentyl-(3,5-dichloro-2-sulfanyl-phenyl)carbonyl-amino]ethanoic acid