2-(5-ethyl-8-oxo-dihydro-[1,3]dioxolo[4,5-g]quinoline-7-carboxamido)acetate
(S)-2-(5-ethyl-8-oxo-dihydro-[1,3]dioxolo[4,5-g]quinoline-7-carboxamido)-3-(p-hydroxyphenyl)propanoate
(S)-2-(5-ethyl-8-oxo-5,8-dihydro-[1,3]dioxolo[4,5-g]quinoline-7-carboxamido)-3-phenylpropanoate
2-(5-ethyl-8-oxo-dihydro-[1,3]dioxolo[4,5-g]quinoline-7-carboxamido)-3-phenylpropanoate
(S)-2-(5-ethyl-8-oxo-dihydro-[1,3]dioxolo[4,5-g]quinoline-7-carboxamido)-4-methylpentanoate