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Chemical Abstracts Service:

Chemical Abstracts Service (CAS) is one of the world’s largest chemical indexes, operated by the American Chemical Society (ACS). It provides the world’s most comprehensive database of chemical substances, chemical reactions, and literature information. The main features of the CAS index are as follows:
1.Unique CAS number: Each compound is assigned a unique CAS number, which consists of three parts, including a hyphen and a number. CAS numbers can be used to accurately identify and retrieve compounds.
2.Contains chemical literature from around the world: The CAS index covers journal articles, patent literature, conference papers, and books from a variety of sources. Researchers can quickly find relevant literature and information about specific compounds through the CAS index.
3.Provide compound properties and structural information: The CAS index also provides detailed information on the physical properties, chemical structure, toxicological data, and preparation methods of the compound. This information is essential for research, development, and safe use of chemicals.

Pubchem:

PubChem PubChem is a free public database maintained by the National Center for Biotechnology Information (NCBI) of the United States. It contains a large number of chemical compound structures, properties and related literature information. The following are the main features of PubChem:
1.Free access: Anyone can access and search the PubChem database for free via the Internet. This allows researchers and students to easily obtain information about compounds.
2.Compound structure search: PubChem provides a powerful search engine based on chemical structure. Users can search for compounds using molecular formula, CAS number or chemical structure.
3.Multiple data sources: PubChem integrates data from various sources, including literature, drug development reports, and high-throughput screening results, etc. This allows researchers to understand the properties and applications of compounds from multiple perspectives.

ChemSpider:

ChemSpider ChemSpider is a chemical database operated by the Royal Society of Chemistry (RSC), covering information on millions of compounds. The following are the main features of ChemSpider:
1.Structure Verification Tool: ChemSpider provides a structure verification tool based on spectral data and literature citations. This tool can help researchers confirm the structure and identity of compounds.
2.Provide a variety of physical and chemical properties information: ChemSpider collects a large amount of information on the physical properties, spectral data, toxicology and environmental impact of compounds. These data are very valuable for the research and development of new chemicals.
3.Community contribution and communication: ChemSpider also provides an online community platform for users to share compound information, comments and discussions. This promotes cooperation and communication in the academic community.

Comprehensive description:

Chemical Abstracts Service (CAS), PubChem and ChemSpider are three important chemical indexes that play a key role in chemical research and application. They provide researchers with chemical literature, compound information and related data worldwide, helping them to quickly and accurately find the chemical information they need. CAS provides a comprehensive database of compounds and literature, as well as unique CAS numbers to identify compounds; PubChem is a free public database that provides compound structure retrieval and multiple data sources; and ChemSpider provides structure verification tools and rich physicochemical property information. The use of these chemical indexes is of great significance to research and application in the field of chemistry.