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Analysis of the scaffold diversity of phytochemicals in IMPPAT 2.0 with seven other natural product libraries, approved drugs, and organic compounds from PubChem. Distribution of (a) the number of ring systems and (b) the number of heteroatoms in scaffolds at the graph/node/bond (G/N/B) level. Cyclic system retrieval (CSR) curves for scaffolds at the (c) G/N/B level, (d) graph/node (G/N) level, and (e) graph level.
