1(R)-(N9-Adenyl)-2(S),3(R)-dihydroxy-4(S)-cyclopentane

[(S)-1-((3aR,4S,6R,6aS)-6-Hydroxy-2,2-dimethyl-tetrahydro-cyclopenta[1,3]dioxol-4-ylcarbamoyl)-ethyl]-carbamic acid tert-butyl ester

Acetic acid (1R,2R,3R,4S)-4-((S)-2-tert-butoxycarbonylamino-propionylamino)-2,3-dihydroxy-cyclopentyl ester

{(S)-1-[(3aR,4S,6R,6aR)-6-(tert-Butyl-diphenyl-silanyloxy)-2,2-dimethyl-tetrahydro-cyclopenta[1,3]dioxol-4-ylcarbamoyl]-ethyl}-carbamic acid tert-butyl ester