• Links to publicly accessible MSDS information are available at House-Hasson A databases at University of Utah Department of Chemistry as well as the Vermont's SIRI database and the ISU MSDS Library index can be searched directly at this side.
• Hazardous Chemical Database is based on a keyword search. Potential keywords include names and formula.
• Find German Chemical Safety Sheets (in German).
• The ATSDR Internet HazDat provides a searchable Database with detailed toxicological profiles of more than 200 compounds.

Patents

• American Patents can be searched at the US Patent Office (USPA). The interface is allows very sophisticated full text searches. Patents can be downloaded as ASCII files as well as graphics. The graphic version is using the Tagged Image File Format (TIFF). Displaying them requires either a TIFF G4 plug-in for the browser, or a properly installed and configured application to which the browser sends the TIFF images for display. Unfortunately, relatively few image viewers and plug-ins handle G4 compression. If you are happy user of an unix-like system, pat2pdf helps to get the patents as PDF file free of charge.
• Via esp@cenet European patents (both EP and patents at the member states) as well as WO, Japanese (PAJ) and worldwide patent documents are available.
• Japanese patents are also available from the Japanese Patent Office.

Other Databases

• ChemExper is an on-line catalog of chemical suppliers. It allows you to find a chemical by molecular formula, name, CAS number, substructure or physical characteristics.
• The NIST WebBook will provides to the full array of data compiled and distributed by NIST under the Standard Reference Data Program. The links are not highlighted, so it takes a little time, to find the right points to click.
• You don't know what's behind the abbreviation of a chemical compound? This can give you the answer.
• The Brookhaven Protein Database offers now a WWW service; the database is really big. There is another query interface at the NIH.
• The EXTOXNET InfoBase with information about pesticides.
• MedChem offers information about names for over 30000 compounds and the synonyms.
• The BioMagResBank provides information about NMR spectra of proteins, peptides, and nucleic acids.
• The NDB (Nucleic Acid Data Base) provides structural information about nucleic acids.
• A collection of crystal structure data for common inorganic ions, molecules, and complexes can be found at the Washington State University.
• A variety of biochemistry related databases can be searched at the National Center for Biotechnology Information.
• A number of interesting databases are found at the RIO-DB of AIST (Agency of Industrial Science and Technology, Japan).
• Very interesting is the Organic Compounds Database from Harold M. Bell at Virginia Tech. The layout is not great, but who cares?
• Demonstrators and research prototypes for Internet-based chemical information services at the University of Erlangen-Nürnberg.
• A list of physical reference data at the National Institute of Standards and Technology including fundamental physical constants and atomic spectroscopic data.
• A number of sides can be used to search for chemical supplier, for example WWW Chemical Network or ChemConnect.

Software

• For the visualization of chemical structures: RasMol (several systems, highly recommended).
• An excellent tool for visualization under Xwindows is molden. Files from the Ab Initio packages GAMESS-UK , GAMESS-US and GAUSSIAN and the Semi-Empirical packages Mopac/Ampac can be used as input. Output is possible for example in povray format for high quality graphics.
• Collections of chemistry related software at ChemDex.
• SAL (Scientific Applications on Linux), a collection of information and links to software that will be of interest to scientists and engineers, has also a good list of chemistry related software.

Miscellaneous

• The e-textbook from Joseph Hornak (Rochester Institute of Technology) is a very good (and free!! :-) ) introduction into NMR spectroscopy.
• The WebElements is the classical on-line periodic table.
• The ChemPuter includes calculations of isotope patterns, element percentage, oxidation state and electron accountancy for metals in a complex. Very useful.
• A good start for information about EPR spectroscopy is EPR at Bristol.
• Interesting is the Chemistry Hypermedia Project at Virginia Polytechnic Institute and State University.
• Looking for web sides of chemical companies? Try IndustryLink or ChemConnect.
• The Dictionary of Science and Technology gives definitions for about 130,000 terms in 130 fields of science.
• A list of links to chemistry related dictionaries at SCIENCEbase.
• Recommendations on Organic & Biochemical Nomenclature, Symbols & Terminology of the IUPAC can be found here.
• chemindustry.com has a directory of chemistry related websites.