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Although the above properties allow rapid application of filters,
they tend to oversimplify relationships between compounds
and therefore offer only partial guidance to chemists planning
syntheses. To illustrate additional possibilities for guidance, we
characterized relationships among CC, NP, and DC¡ä, using three
chemical spaces that shed light on different aspects of structure
variation (Fig. 3). First, we considered atom counts: PCA of
this chemical space reveals that carbon, nitrogen, and oxygen are
the dominant contributors to variation (Fig. 3A). Notably, NP
achieves most of its variation with oxygen and carbon, with little
variation in nitrogen composition (Fig. 3B). In contrast, both CC
and DC¡ä get most compositional variation from nitrogen and
carbon. Second, to examine compounds in terms of ring and sidechain
content, we used descriptors counting rings, side chains,
and branches (Fig. 3 C and D).
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