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Table 4 Error analysis of the false positives (percentage) for ChemSpider and Chemlist.

From: Automatic vs. manual curation of a multi-source chemical dictionary: the impact on text mining

Error type False positives
  ChemSpider Chemlist
Partial match 21 (64%) 96 (41%)
Annotation error 11 (33%) 29 (13%)
Out of corpus scope 1 (3%) 79 (34%)
Not a chemical 0 28 (12%)