B19-: an aromatic Wankel motor.

@article{JimnezHalla2010B19AA,
  title={B19-: an aromatic Wankel motor.},
  author={J. O. C. Jim{\'e}nez-Halla and Rafael Islas and T. Heine and G. Merino},
  journal={Angewandte Chemie},
  year={2010},
  volume={49 33},
  pages={
          5668-71
        }
}
Recently, Huang et al. found that the lowest energy form of B19 (1) is a beautiful ring structure with two planar paromatic systems nested inside one another. The inner fragment (ring A) is a pentagonal six-atom group sharing two p electrons, surrounded by a peripheral layer of thirteen boron atoms (ring B), sharing further ten p electrons (Figure 1). Interestingly, both fragments individually satisfy 
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