Pubmed book Could Not save items
http://www.ncbi.nlm.nih.gov/sites/entrez?db=books&cmd=Search&term=translation%20AND%20stryer%5Bbook%5D&doptcmdl=TOCView
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Following your link, I noticed that the page actually lists NCBI books, not PubMed content. While we support PubMed, we don't do NCBI books. Taking a quick look at the NCBI books page you linked to, though, it looks like that there isn't enough information on that particular page for Zotero to scrape.
This one http://www.ncbi.nlm.nih.gov/sites/entrez?db=Books is a list of all the books and has more info, but it's debatable if it's worth scraping.
Best regards,
Ajasja