Intermediate compounds, including 2-(t-butyldimethylsilyloxymethyl)-3,4-[(dimethylmethylene)dioxy]-5-hydroxy -tricyclo[5.2.1.0.sup.2,6 ]dec-8-ene, which are useful for the synthesis of neplanocin A having strong antitumor activity. Improved processes for the preparation of neplanocin A, starting from optically active 2-hydroxymethyl-5-hydroxy-tricyclo[5.2.1.0.sup.2,6 ]deca-3,8-diene and via a key step comprising a retro-Diels-Alder reaction of the above intermediate.

 
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> .alpha.- and .beta.-amino acid hydroxyethylamino sulfonyl urea derivatives useful as retroviral protease inhibitors

> Imaging of neuronal material

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