Use of 3D Properties to Characterize Beyond Rule-of-5 Property Space for Passive Permeation

The application of conformationally dependent measures of size and polarity to characterize beyond rule-of-5 (Ro5) space for passive permeation was investigated. Specifically, radius of gyration, an alternative to molecular weight, and three-dimensional polar surface area and the generalized Born/surface area dehydration free energy, alternatives to hydrogen-bond donor and acceptor counts, were computed on models of the permeating conformations of over 35 000 molecules. The resulting guidelines for size and polarity, described by the 3D properties, should aid the design of Ro5 violators with passive permeability.

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