Since the patent dataset in PubChem is huge (>4 TB of data), subsets were used to perform these analyses. Distinct topics of interest to the environmental community were chosen to explore further, including legacy pollutants (polychlorinated biphenyls -PCBs), agrochemicals (generally data-rich chemicals) and emerging pollutants of concern (bisphenols and their alternatives, plus PFAS). Curated lists of chemicals (often called "suspect lists") were extracted from online resources, including the NORMAN Suspect List Exchange (NORMAN-SLE) , CompTox , the PubChem PFAS Tree and the PubChem Compound Table of Contents (TOC) Tree 2 in the PubChem Classification Browser. The agrochemical lists included the "Agrochemical Information", "EU Pesticides Data" and "USDA Pesticides Program" sections from the PubChem TOC Tree 2 and the S28 EUBIOCIDES 24 list from the NORMAN-SLE. The bisphenol lists included S20 BISPHENOLS and the alternatives list S97 UBABPAALT from the NORMAN-SLE, while a polychlorinated biphenyls (PCBs) list was extracted from CompTox . For PFAS these included the PFAS considered in the PARC project (S102 PARCPFAS ) and potential persistent, mobile, toxic (PMT) PFAS (S111 PMTPFAS ) from the NORMAN-SLE plus four Stockholm Convention lists from the regulatory section of the PubChem PFAS Tree: the initial and updated perfluorooctanoic acid (PFOA) listing , the initial perfluorohexane sulfonic acid (PFHxS) list and the proposed C9-C21 long chain perfluoroalkylcarboxylic acids (LC-PFCAs) listing .