Chemistry

has molecular and biochemical information on enzymes that have been classified by the IUBMB.

is a freely accessible database of chemicals. This website contains substances with their synthesis references and physical properties

a free chemical structure database providing fast text and structure search access to over 57 million structures from hundreds of data sources

search engine for chemical molecules, contains over 7 million unique molecules from chemical suppliers and all of entries from NIST, PubChem, and DrugBank

ENZYME is a repository of information relative to the nomenclature of enzymes.

Expasy is the bioinformatics resource portal of the SIB Swiss Institute of Bioinformatics. It is an extensible and integrative portal which provides access to over 160 databases and software tools, developed by SIB Groups and supporting a range of life science and clinical research domains, from genomics, proteomics and structural biology, to evolution and phylogeny, systems biology and medical chemistry.

KEGG is a database resource for understanding high-level functions and utilities of the biological system, such as the cell, the organism and the ecosystem, from molecular-level information, especially large-scale molecular datasets generated by genome sequencing and other high-throughput experimental technologies.

The National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.

Collection of data on chemicals collected by the National Institute of Science and Technology. The dataset is searchable by chemical names, formulas, CAS registry numbers, structures, and various physical properties of chemicals.

PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

Information about the 3D shapes of proteins, nucleic acids, and complex assemblies that helps students and researchers understand all aspects of biomedicine and agriculture, from protein synthesis to health and disease.

Search for Safety Data Sheets. A safety data sheet, or SDS, is a standardized document that contains occupational safety and health data. The International Hazard Communication Standard (HCS) mandates that chemical manufacturers must communicate a chemical’s hazard information to chemical handlers by providing a Safety Data Sheet. SDS's typically contain chemical properties, health and environmental hazards, protective measures, as well as safety precautions for storing, handling, and transporting chemicals.

hosted by the National Institute of Advanced Industrial Science and Technology of Japan, and contains extensive spectroscopic data for organic compounds including infrared and NMR spectroscopy and mass spectrometry

has tools to help students learn the concepts of molecular symmetry.

UniProt is the world’s leading high-quality, comprehensive and freely accessible resource of protein sequence and functional information.

PyMOL is a user-sponsored molecular visualization system on an open-source foundation, maintained and distributed by Schrödinger.

"The Royal Society of Chemistry's interactive periodic table features history, alchemy, podcasts, videos, and data trends across the periodic table. Click the tabs at the top to explore each section. Use the buttons above to change your view of the periodic table and view Murray Robertson's stunning Visual Elements artwork."

Pharos is the user interface to the Knowledge Management Center (KMC) for the Illuminating the Druggable Genome (IDG) program funded by the National Institutes of Health (NIH) Common Fund.

ChemHAT, the Chemical Hazard and Alternatives Toolbox, is an internet database designed to offer up easy to use information that we can use to protect ourselves, our families and our co-workers against the harm that chemicals can cause.

Supply chain software that includes searching for information on chemical hazards.
Requires signing up for a free account.