Directory and searchable database for chemical names, molecular formulae, and CAS numbers.

Portal to a wide range of chemical information for reference and research purposes.

Free chemical database searchable by chemical name and chemical structure, offering access to more than 26 million structures collected from a multitude of data sources.

Design Institute for Physical Properties – a scientific project aims to provide information related to evaluated standard thermophysical property values.

Features products and services specially developed for the chemoinformatics industry.

Index of information related to pesticides and other environmental contaminants.

Provides an annual compilation of procedures related to the synthesis of organic compounds.

Knowledge base sponsored by the National Library of Medicine. Provides information on the biological activities of small molecules.

Open, freely distributable, and extensible digital collection of molecular structures information.

Offers the drug discovery industry with important chemistry and chemistry-related information and services.

Free and interactive database providing information and procedures related to synthetic chemistry.