CA Registry Numbers

We have briefly talked about the presence of CA Registry Numbers in the Index Guide and Chemical Substance Index.

CA Registry Numbers look like this:

[12345-67-891]

The CA Registry Number is a unique number assigned to each chemical substance identified since 1956. Although generated by a computer algorithm based on a connection table which identifies each substance on the basis of an unambiguous description of it's molecular structure, it has no chemical significance. Howver, it serves as a unique tag or identifier for a substance.

Registry numbers are included from the Ninth Collective indexing period in:

The CA Registry Number is searchable in both online Chemical Abstracts and Medline.

Hint:When searching online for your substance, be sure you know the Registry number and USE IT.