(1R,9R,10S,12S)-12-Hydroxy-10-hydroxymethyl-8-methylamino-11-oxa-2,6,8-triaza-tricyclo[7.2.1.02,7]dodeca-3,6-dien-5-one

2,3'-(aminoimino)-1-(5'-O-benzoyl-3'-deoxy-β-D-lyxofuranosyl)uracil

2,2'-anhydro-1-(5'-O-benzoyl-3'-O-methanesulfonyl-β-D-arabinofuranosyl)uracil

5'-chloro-O2',O3'-bis-(toluene-4-sulfonyl)-5'-deoxy-uridine

(2R)-3t-benzoyloxymethyl-11syn-hydroxy-2,3-dihydro-1H-2r,5c-methano-pyrimido[1,2-c][1,3,5]oxadiazepin-9-one