Number CASE

The number CASE ( CASE number or CASE registry number in English) of a Polymeric chemicals, , biological sequence and Alliage is its number of single recording near the data bank of Chemical Abstracts Service (CASE), a division of the American Chemical Society (ACS). The CASE assigns these numbers with each chemicals which were described in the literature. Moreover, CASE maintains and markets a database of these substances, the CASE Registry .

Approximately 30 million compounds received a number CASE until now. Approximately 4  000 new numbers are added each day. The goal is to facilitate research in the databases, considering the chemicals have often various names. Almost all the databases of current molecules allow a research by number CASE.

The numbers CASE are allotted in an order ascending and do not have particular significance. An entry is declined in three parts separated by an indent. The first can contain to six digits, the second contains two digits, whereas the third contains a figure for the Somme of control. The sum of control is calculated by taking the 1st figure time 1, 2nd time 2, and so on. The sum of these intermediate results is then added Modulo 10. For example, the number CASE of the Eau is 7732-18-5: its sum of control is worth (8×1 + 1×2 + 2×3 + 3×4 + 7×5 + 7×6) MOD 10 = 105 MOD 10 = 5.

Different the Isomère S from a Molécule has a number different CASES: the D- Glucose has 50-99-7, the L-glucose has 921-60-8, the α-D-glucose has 26655-34-5, etc Contrary sometimes, a complete class of molecules receives only one number: the group of the alcohols déshydrogénases has 9031-72-5.

At the time of research by number CASE in the databases, it is useful to include the number of close compounds. For example, to seek information on the Cocaine (CASE 50-36-2), it is necessary also to seek for hydrochlorate of cocaine (CASE 53-21-4), since it is in this form that cocaine is used as a drug.

To find the number CASE of a compound starting from its name, of its Chemical formula or its structure, the following free resources are available:

  • ChemIDplus (NIH)
  • Chemistry WebBook (NIST)
  • NCI Database Browser
  • Dutch Dictionary one Organic Chemistry
  • Portal and System Information one Chemicals Substances (With French names)

See too

Related articles

External bonds

  • Site of the CASE
  • Description of the register CASE
  • http://chemfinder.cambridgesoft.com/

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