Fig. 14
Top-10 most frequent atom environments with radius r = 1 in PubChem. Percentages indicate incidence of the atom environment in the respective database: a Substance, and b Compound. Light gray structures clarify valence and connectivity. Dashed lines indicate aromatic bonds as perceived using the aromaticity model OEAroModelOpenEye in the OpenEye Scientific Software, Inc. OEChem C++ toolkit [57].