50 million chemical substances! CAS reaches milestone.

On the 7th september, 2009, the Chemical Abstracts Service (CAS) announced that it had registered its 50 millionth substance --> CAS 1181081-51-5, a novel heterocycle with analgesic properties.

The 40 millionth substance was registered just 9 months ago, indicating an acceleration of the sysnthesis and innovation in science. We are not voulnteering to do the research, but it would be interesting to know how many paper chemicals there are among the 50 million.