(S)-2-Amino-5-benzyloxy-3-hydroxy-pentanoic acid ((3aS,5S,5aR,8aR,8bS)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethyl)-amide

2-Amino-3-benzyloxy-2-benzyloxymethyl-N-((3aS,5S,5aR,8aR,8bS)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethyl)-propionamide

{(S)-4-Benzyloxy-2-hydroxy-1-[((3aS,5S,5aR,8aR,8bS)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethyl)-carbamoyl]-butyl}-carbamic acid tert-butyl ester

{(S)-5-Benzyloxy-2-hydroxy-1-[((3aS,5S,5aR,8aR,8bS)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethyl)-carbamoyl]-pentyl}-carbamic acid tert-butyl ester

N-{(1S,2R)-3-Benzyloxy-2-hydroxy-1-[((3aS,5S,5aR,8aR,8bS)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethyl)-carbamoyl]-propyl}-succinamic acid