ctxR: Utilities for Interacting with the 'CTX' APIs

Access chemical, hazard, bioactivity, and exposure data from the Computational Toxicology and Exposure ('CTX') APIs. 'ctxR' was developed to streamline the process of accessing the information available through the 'CTX' APIs without requiring prior knowledge of how to use APIs. Most data is also available on the CompTox Chemical Dashboard ('CCD') and other resources found at the EPA Computational Toxicology and Exposure Online Resources.