2-Acetylamino-4-{4-[4-(2-oxo-3,4-dihydro-2H-quinolin-1-yl)-piperidine-1-carbonyl]-phenoxy}-butyric acid

2-Acetylamino-4-{4-[4-(2-oxo-3,4-dihydro-2H-quinolin-1-yl)-piperidine-1-carbonyl]-phenoxy}-butyric acid ethyl ester

2-Acetylamino-2-(2-{4-[4-(2-oxo-3,4-dihydro-2H-quinolin-1-yl)-piperidine-1-carbonyl]-phenoxy}-ethyl)-malonic acid monoethyl ester