PubChem
PubChem is a free, publicly accessible database of chemical molecules and their biological activities. It is maintained by the National Center for Biotechnology Information (NCBI) at the National Library of Medicine (NLM) which is part of the National Institutes of Health (NIH).
PubChem features comprehensive chemical information, data on chemical structures, properties, safety, toxicity, biological activities, patents, literature and more.
With data coverage on toxicity, environmental effects, safety data sheets (SDS), pharmacology, and drug interactions, it is one of the NLM services that absorbed the retired TOXNET.
