The CAS Source Index (CASSI) Search ToolA database of Chemical Abstracts Service publications since 1907, CASSI can quickly and easily confirm publication titles & abbreviations, as well as CODEN, ISBN, or ISSN codes.
ChemSpiderChemical structure database providing text and structure access to over 67 million structures from hundreds of data sources.
NIST Chemistry WebBookProvides users with easy access to chemical and physical property data for chemical species through the internet.
NIST Topics: Chemistry StandardsNational Institute of Standards & Technology, part of the U.S. Department of Commerce, sets requirements and specifications to ensure that materials, products, processes and services are fit for their purpose.
PubChemOpen access chemistry database at the National Institutes of Health.