(3aS)-3c-benzoyloxy-2t-hydroxymethyl-(3ar,9ac)-2,3,3a,9a-tetrahydro-furo[2',3':4,5]oxazolo[3,2-a]pyrimidin-6-one

(3aS)-2t-acetoxymethyl-3c-benzoyloxy-(3ar,9ac)-2,3,3a,9a-tetrahydro-furo[2',3':4,5]oxazolo[3,2-a]pyrimidin-6-one

2',3'-O-(benzylidene)uridine

(2R,3R,3aS,9aS)-2-[(三苯甲基氧基)甲基]-2,3,3a,9a-四氢-4aH-呋喃并[2',3':4,5][1,3]恶唑并[3,2-a]嘧啶-3,6-二醇

(6R)-7c,8c-diacetoxy-7,8,9,10-tetrahydro-6H-6r,9c-epoxido-pyrimido[2,1-b][1,3]oxazocin-2-one