CAS-Numer
At CAS-Numer (faan ingelsk: Chemical Abstracts Service) as en internatsionaal betiaknang för cheemisk materiolen. Hat as iandüüdag an sodenang jaft at nian ferwakslangen. So haa uk ünlik isomeeren faan en moleküül ünlik CAS-numern.
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Bispalen
Luke uk diar
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