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Structures of (a) N6,N6-dimethyladenosine (m6,6A), N6,N6,2’-O-trimethyladenosine (m6,6Am), and puromycin. (b) Thieno- and isothiazolo- derived purines bearing dimethylamine substituents. (c) Thieno- and isothiazolo- derived purines bearing azetidine and difluoroazetidine substituents.
