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| Chemical Information SIS | National Library of Medicine. Almost 400,000 chemical records |
| Chemistry WebBook | National Institute of Standards and Technology. Search by formula, name, molecular weight, etc. Thermochemistry for 8,000 compounds, enthalpy of reaction for 3,000 reactions, infrared spectra for 16,000 compounds, mass spectra for 15,000 compounds, ion energetics data for 16,000 substances. |
| Hazardous Substances Data Bank | National Library of Medicine. Search for the toxicity of single or compound substances. |
| PubChem | National Center for Biotechnology Information. Descriptions of >7 million substances and 5 million compounds.Also, datasets of bioactivity against specific targets. |
| Virtual Library | National Institute of Standards and Technology. Llinks to NIST data, databases, bbibliographies, and links to information, organization, and commercial sites. |