Figure 3
From: Natural product-likeness score revisited: an open-source, open-data implementation

Distribution of NP-likeness score for the training (synthetic molecules and natural products) and the test datasets. The synthetic molecules are a subset of the clean lead-like collection from the ZINC database and the natural products are small molecules from ChEMBL database referenced to Journal of natural products. The more positive the score, the higher is the NP-likeness and vice versa.