From: Optimising chemical named entity recognition with pre-processing analytics, knowledge-rich features and heuristics
Subtype
Frequency
Percentage
Abbreviation
1,882
30.32%
Formula
1,291
20.80%
Family
979
15.77%
Trivial
926
14.92%
Systematic
693
11.16%
Identifier
293
4.72%
Multiple
118
1.90%
No class
25
0.40%