PNAS – National Academy of Sciences of the USA on Highwire:

78,379 articles indexed; 2 indices created to be linked into the literature search; linking strategy: pnas.org URL; indexing type: link back to full text (chemical name to structure conversions to follow)

ChemBlink:

18,453 web pages scanned; ChemSpider structure records to be created; linking strategy: chemblink.com URL; indexing type: Chemical name, structure, synonyms and property data and link back to original web page.

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