N-(4-benzyloxycarbonylamidino-benzyl)-2-[(R)-3-oxo-4-(3-phenyl-propylamino)-morpholin-2-yl]-acetamide acid benzyl ester

[(R)-3-oxo-4-phenylacetamido-morpholin-2-yl]-acetic acid

[(R)-4-isopropoxycarbonylamino-3-oxo-morpholin-2-yl]-acetic acid

N-(4-benzyloxycarbonylamidino-benzyl)-2-[(R)-4-benzenesulfonylamino-3-oxo-morpholin-2-yl]-acetamide acid benzyl ester