Z-Asp-OH
Z-Asp-OMe
Z-Asp-OtBu·DCHA
Z-Asp(OBzl)-OH
Z-Asp(OMe)-OH
Z-Asp(OtBu)-OH·H2O
Z-Asp(OtBu)-OH·DCHA
Z-Asp(OtBu)-OSu
Z-D-Asp-OH
Z-D-Asp-OMe
Z-D-Asp(OtBu)-OH·H2O