在 STN 上检索零引用物质
若要了解 CAS REGISTRYSM 中在 STN® 数据库内没有任何文献或专利引用的物质，请查阅以下字段：
- 注册来源 (SR)
针对 CAS 登记号®对于 97314-93-7 及以后的 CAS 登记号，SR 字段指明了该物质首次注册的原因。您可以对 SR 字段的内容进行 EXPAND（扩展）或 SEARCH（检索）。
- 类别标识符 (CI)
对于为支持 CAS 注册政策而注册的物质，CI 字段可以提供关于该物质注册原因的额外见解。
REGISTRY 中在 STN 数据库内没有任何文献或专利引用的物质示例。
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The substance was initially registered
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And the SR (and CI) field contains
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Then the substance is
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To find additional information
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To support CAS registration policies
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SR: CA
CI: COM
SR: CA Index GuideTM or Ring Systems Handbook *
CI: RPS
SR: GENBANK®
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A component of a multicomponent substance such as a copolymer, salt, or mixture
A ring parent, i.e., the main ring system excluding substituents
A translated protein from GenBank
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Search the CAS Registry Number in the Component Registry Number (/CRN) field to retrieve the multicomponent substances containing this component. Many of these multicomponent substances will have references.
Display the Ring System Data information, i.e., D RSD, to obtain the Ring Identifier (RID) for the ring system, e.g., 7086.54.2. Search the first two parts of the RID in the /RID field to obtain substance(s) containing the ring system. Many of the compounds containing ring systems will have references.
Use the SEQLINK EXACT command to locate the CAS Registry Numbers for all sequences with the same backbone. Use the CAS Registry Numbers for comprehensive retrieval of associated references.
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From chemical libraries in CAS Chemical Supplier Insights
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SR: Chemical Library
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An individual member of a chemical library
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Most of these substances are either new registrations not yet linked to CAS Chemical Supplier Insights or substances that were removed from CAS Chemical Supplier Insights at the suppliers request. See the name of the supplier in the SR field.
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From chemical catalogs in CAS Chemical Supplier Insights
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SR: Chemical Catalog
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From a chemical catalog
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Most of these substances are either new registrations not yet linked to CAS Chemical Supplier Insights or substances that were removed from CAS Chemical Supplier Insights at the suppliers request. See the name of the supplier in the SR field.
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From web sources
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SR: Other Sources
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From a web source
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Contact the database supplier listed under SR.
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From a reaction database
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SR: Reaction Database
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From processing of a reaction database
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Check the LC field.
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From data collections that are not represented in STN databases
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SR: American Society of Hospital Pharmacists
SR: Environment Canada
SR: European Union
SR: U.S. Adopted Names Council (USAN)
SR: U.S. Environmental Protection Agency (US EPA)
SR: U.S. National Library of Medicine (NLM)
SR: World Health Organization (WHO)
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Included at the request of one of these agencies
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Consult the original source for any additional known information.
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By CAS Registry Services
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SR: CAS Client Services
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Included as a request submitted to CAS Registry Services
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Additional information is not available.
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*《CA 索引指南》(CA Index Guide) 和《环系手册》(Ring Systems Handbook) 已停止发行。
因 REGISTRY 更新而获得参考文献的物质
SR 字段的内容反映了物质最初注册的原因。然而，由于 REGISTRY 数据库每日更新，最初注册时没有参考文献的物质后续可能会添加相关信息。以下是两个最初从其他来源注册的物质示例。第一个示例没有任何关联的参考文献，而第二个示例关联了 CASM/CAS 参考文献。
暂无参考文献：
已有参考文献：
