(E)-(3S,7R)-7-Hydroxy-3-(6-methoxy-pyridin-3-yl)-9-(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-yl)-non-5-enoic acid ethyl ester

3-(6-Methoxy-pyridin-3-yl)-5-oxo-pentanoic acid ethyl ester

5-Hydroxy-3-(6-methoxy-pyridin-3-yl)-pentanoic acid ethyl ester

3-(5,6,7,8-Tetrahydro-[1,8]naphthyridin-2-yl)-acrylic Acid Ethyl Ester

[2-Oxo-4-(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-yl)-butyl]-phosphonic Acid Dimethyl Ester