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We have calculated the molecular resonance energy for '‘superphenalene,’' a recently reported giant benzenoid that can be viewed as obtained from three fused '‘superbenzenes’' (hexa-peri-hexabenzocoronenes). Using the method of conjugated circuits we derived quantitative characterization of Clar's qualitative description of the considered benzenoids as composed from disjoint '‘π-sextets.'' The calculations show the degree of differentiation between neighboring rings, which decreases as we progressively move towards the center of the molecule.
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Randić et al. (1999) studied this question.
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