CAS - Chemical Abstracts Service - Database Counter...

In addition to organic and inorganic substances, REGISTRY has:
69,298,520 sequences
CAS RN 2756816-06-3 is the most recent CAS Registry Number

CAS also provides specialized databases of chemical reactions, regulated chemicals, commercially available chemicals and Markush substance information.

Specialized Substance Collections Count
CASREACT® 142,087,534 Single and multi-step reactions, and synthetic preparations
CHEMLIST® 417,385 Inventoried/regulated substances
CHEMCATS® Commercially available chemicals
MARPAT® 1,355,218 Searchable Markush structures