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Proposed fragmentation of the experimentally documented pentacyclic intermediate (shown in the tautomeric forms 2a and 2b). The different fragmentation paths originating from the two tautomeric forms afford either 4 and 5 or 1 and 8 (i.e. the neutral and exomethylene anion form of the 6,7-dimethyl-8-ribityllumazine).
