3-oxo-2-oxa-bicyclo[2.2.1]heptane-5-carboxylic acid methyl ester

(1R,2R,4S)-2-((S)-1-tert-butoxycarbonyl-butylcarbamoyl)-4-hydroxy-cyclopentanecarboxylic acid methyl ester

(1R,2R,4S)-2-((S)-1-tert-butoxycarbonyl-butylcarbamoyl)-4-(7-methoxy-2-phenyl-quinolin-4-yloxy)-cyclopentanecarboxylic acid methyl ester

(1R,2R,4R)-2-((1R,2S)-1-Ethoxycarbonyl-2-vinyl-cyclopropylcarbamoyl)-4-(7-methoxy-2-phenyl-quinolin-4-yloxy)-cyclopentanecarboxylic acid

(1R,2S)-1-{[(1R,2R,4S)-2-((S)-1-cyclopentylcarbamoyl-2,2-dimethyl-propylcarbamoyl)-4-(7-methoxy-2-phenyl-quinolin-4-yloxy)-cyclopentanecarbonyl]-amino}-2-vinyl-cyclopropanecarboxylic acid ethyl ester