Chemical Abstracts Service Registry

The CAS (Chemical Abstracts Service) Registry is the CAS substance collection, and is a division of the American Chemical Society and contains databases of chemical information. CAS Registry Numbers (often referred to as CAS RNs or CAS Numbers) are universally used to provide a unique, unmistakable identifier for chemical substances. A CAS Registry Number itself has no inherent chemical significance but provides an unambiguous way to identify a chemical substance or molecular structure when there are many possible systematic, generic, proprietary or trivial names. For common and frequently regulated chemicals the related CAS Common Chemistry database, an open community resource with nearly 500,000 chemical substances from CAS REGISTRY, is available. For more unique substances, complete and submit a CAS Registry Lookup service order form and receive results within 24 hours.化学文摘社（Chemical Abstracts Service，CAS）登记库（CAS Registry）是CAS的物质馆藏集合，同时作为美国化学学会（American Chemical Society，ACS）的下属部门，收录各类化学信息数据库。CAS登记号（CAS Registry Number，常简称为CAS RN或CAS号）被全球广泛用作化学物质的唯一、明确标识符。CAS登记号本身并不具备内在化学意义，但当存在多种系统命名、通用命名、商品名或俗名时，它可提供一种无歧义的化学物质或分子结构识别方式。针对常见且常受监管的化学物质，可使用与之相关的CAS通用化学数据库（CAS Common Chemistry）——该数据库为开放社区资源，源自CAS登记库，收录近50万种化学物质。若需查询更为小众的化学物质，可填写并提交CAS登记库查询服务订单，即可在24小时内获取查询结果。

搜集汇总

背景与挑战

背景概述

CAS REGISTRY是一个权威的化学物质信息数据库，收录超过2.9亿种物质，每日更新。CAS Registry Numbers（CAS RNs）作为唯一的数字标识符，用于精确识别化学物质，支持全球科研、工业和监管领域的沟通与数据链接。