tert-butyl 3-(4-{[(2R)-2-{[tert-butyl(dimethyl)silyl]oxy}-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethyl]amino}piperidin-1-yl)propanoate

benzyl (4-{[(2R)-2-{[tert-butyl(dimethyl)silyl]oxy}-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethyl]amino}piperidin-1-yl)acetate

5-[(R)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-({1-[2-(2-phenylethoxy)ethyl]piperidin-4-yl}amino)ethyl]-8-hydroxyquinolin-2(1H)-one

N-[2-(4-{[(2R)-2-{[tert-butyl(dimethyl)silyl]oxy}-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethyl]amino}piperidin-1-yl)ethyl]benzenesulfonamide

5-[2-{[1-(2-benzyloxy-ethyl)-4-hydroxy-piperidin-4-ylmethyl]-amino}-(1R)-(tert-butyl-dimethyl-silanyloxy)-ethyl]-8-hydroxy-1H-quinolin-2-one