Assertion: type b purine | /r/CapableOf | reveal alternate mechanism
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text: Following purification and characterization, products were classified into two categories: (i) type A purines, containing a C8 substituent (R1) derived from the amide used and (ii) type B purines, with the C8 substituent (R2) revealing an alternate mechanism where the cyclo-condensation agent appeared to originate from the alcohol/alkoxide species (see Fig. 3).