The Beilstein Registry Number is a way of identifying compounds similar to the
CAS registry number. It is the
unique identifier
A unique identifier (UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. The concept was formalized early in the development of computer science and information systems. ...
for compounds in the
Beilstein database.
References
Chemical numbering schemes
{{chem-stub