With the maximum number of bonders for a site limited to 2, the class is written as 𝒮 3(2) ℬ 3 . For the 𝒮 3(2) ℬ 3 class there are 6 families, 10 genera, and 174 species. The corresponding genera and families shown in Fig. . Following the pattern for freebase subporphyrin monoanion (see Fig. ) and free-base subporphyrin (Figs. and), the graphs for genera 27 -34 has the topology of a 3-torusthough with missing graph vertices arising from the criterion of excluding three bonders on a single site. Electronic files describing the 𝒮 3(2) ℬ 3 partitioned free-base triphyrin[2.2.2] system are provided in the Supplementary Information.