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- ...nrelated to CAS. I don't think Wikipedia should drive traffic from all our chemistry articles to such a site without a very good justification. Was such a justi ...re in PubChem. The problems I noticed were related to polymers and complex compounds, the absence of a documented CAS filter in PubChem, leading to false hits,31 كيلوبايت (4٬499 كلمة) - 15:55، 7 أغسطس 2013