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50 Millionth Unique Chemical Substance Recorded in CAS REGISTRY(SM)
Date:9/8/2009

COLUMBUS, Ohio, Sept. 8 /PRNewswire/ -- Chemical Abstracts Service (CAS), a division of the American Chemical Society, announced that on September 7 it recorded the 50 millionth substance in CAS REGISTRY, the world's most comprehensive and high-quality compendium of publicly disclosed chemical information. The recently registered substance is a novel arylmethylidene heterocycle with analgesic properties. Reaching the 50 million mark so quickly is an indicator of the accelerating pace of scientific knowledge. CAS registered the 40 millionth substance just nine months ago - in contrast, it took 33 years for CAS to register the 10 millionth compound in 1990.

Information professionals and scientists around the world have taken note of this important milestone." The rapid growth of CAS REGISTRY is a mirror of the breadth and depth of creativity in research labs throughout the world," said Grace Baysinger, head librarian at the Swain Chemistry and Chemical Engineering Library at Stanford University. "CAS REGISTRY is an indispensable resource for users in research, education, and industry."

"Achieving a milestone of 50 million small molecules registered, which I congratulate CAS for, has given us two major insights; one is that a novel substance is either isolated or synthesized every 2.6 seconds on the average during the past 12 months, day and night, seven days a week in the world, showing an almost unbelievable rate of progress in science," said Dr. Hideaki Chihara, Ph.D. chemist and former president of Japan Association for International Chemical Information. "The other is that CAS is maintaining its reputation as the world's largest compilation of substance information that every scientist in the world relies on either directly or indirectly."

REGISTRY is the only integrated collection of
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