ChemIDplus chemical structure images were added to Hazardous Substances Databank (HSDB) records. The chemical structures can be viewed in the HSDB record header with the chemical name and registry number. Users can save the chemical structure as a ".png" file using a right mouse click. This feature is not available via the HSDB document download feature These structures are also available in: Chemical Carcinogenesis Research Information System (CCRIS), Comparative Toxicogenomics Database (CTD)™, GENETOX, Integrated Risk Information System (IRIS) and International Toxicity Estimates for Risk (ITER).