In the course of studies on the structure-activity relationships of 6-substituted purines,^both 6-trans-(l) and 6-cw-styrylpurine (2) were required to investigate the steric effect of the 6-substituents on cytokinin activity. The synthesis and cytokinin activity of 1 have already been
Reductones and quinones have been shown to cause strand scission of nucleic acids and in vitro inactivation of viruses.1} Oxygen radicals generated by the autoxidation of the reducing agents are mainly responsible for the observed biological activity.1>2) Common reducing aldoses and ketoses do not usually show virusinactivating ability.3* Recently however, we have reported4'5) that some reducing sugar phosphates generate superoxide at pH 10.4
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