Figure 2.
Figure 2 a. All 1–3-ring scaffold topologies and all 4-ring topologies possessing only 3-nodes or only 4-nodes. See Table 2 for further identification
Figure 2 b. Examples21 from the databases examined of molecules that exhibit each 1–3-ring topology and each 4-ring topology possessing only 3-nodes or 4-nodes, corresponding to the topologies in Figure 2. Note that none of the databases examined possessed an example of topology number 17. See Table 2 for further identification.