Ba~ aadenosine,~ and 8-amino-6-fluoro-9-(/3-D-ribof~ ranosy1) purine.~ A nucleoside antibiotic that has attracted considerable interest is formycin A (% a), a C-nucleoside closely resembling adenosine (N-9 and C-8 of adenosine are juxtaposed). Formycin A has a wide variety of biological effects, including some in vivo anticancer activity."'In terms of metabolism in mammalian cells, it is phosphorylated by adenosine kinase, carried all the ...