ethyl 5-(4-methoxyphenyl)-5-oxopentanoate
ethyl 3-O-benzoyl-5,6,7,8,9-pentadeoxy-6-fluoro-1,2-O-isopropylidene-α-D-ribo-dec-5(Z)-enofuranuronate
ethyl 3-O-benzoyl-5,6,7,8,9-pentadeoxy-6-fluoro-1,2-O-isopropylidene-α-D-xylo-dec-5(Z)-enofuranuronate
ethyl 5-phenyl-5-N-(2-pyridylsulfonylamino)pentanoate
ethyl 5-N-(2-pyridylsulfonylamino)-5-(3-tolyl)pentanoate