(S)-4-Hydroxy-2-(tetrahydro-pyran-2-yloxy)-butyric acid benzyl ester
(S)-3-(Tetrahydro-pyran-2-yloxy)-dihydro-furan-2-one
3,4-dihydro-2H-pyran
(S)-4-Oxo-2-(tetrahydro-pyran-2-yloxy)-butyric acid benzyl ester
(S)-2-oxotetrahydrofuran-3-aminium trifluoroacetate
2-{[3-Benzyloxycarbonyl-3-(tetrahydro-pyran-2-yloxy)-propyl]-tert-butoxycarbonyl-amino}-4-hydroxy-butyric acid benzyl ester
2-{[3-Benzyloxycarbonyl-3-(tetrahydro-pyran-2-yloxy)-propyl]-tert-butoxycarbonyl-amino}-4-oxo-butyric acid benzyl ester
(S)-1-((S)-3-Benzyloxycarbonyl-3-{[(S)-3-benzyloxycarbonyl-3-(tetrahydro-pyran-2-yloxy)-propyl]-tert-butoxycarbonyl-amino}-propyl)-azetidine-2-carboxylic acid benzyl ester
2'-deoxymugineic acid
(S)-2-{[(S)-3-Benzyloxycarbonyl-3-(tetrahydro-pyran-2-yloxy)-propyl]-tert-butoxycarbonyl-amino}-4-hydroxy-butyric acid benzyl ester