(3aS,5S,6R,6aR)-1,3-dibenzyl-6-(benzyloxy)-5-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)hexahydro-2H-furo[2,3-d]imidazol-2-one

(R)-3-(benzyloxy)-3-((4S,5S)-1,3-dibenzyl-5-cyano-2-oxoimidazolidin-4-yl)-2-oxopropyl acetate

5-((3aS,6aR)-1,3-dibenzyl-4-hydroxy-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoic acid

(2R)-2-[(4R)-3-benzyl-2-oxathiazolidin-4-yl]-2-benzylaminoacetonitrile

ethyl 5-((3aS,6aR)-1,3-dibenzyl-2-oxotetrahydro-1H-thieno[3,4-d]imidazol-4(2H)-ylidene)pentanoate