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Table 10 Example of a token sequence tagged with matches against chemical dictionaries.

From: Optimising chemical named entity recognition with pre-processing analytics, knowledge-rich features and heuristics

Token Normal form ChEBI DrugBank CTD PubChem Jochem
For for O O O O O
the the O O O O O
preparation preparation O O O O O
of of O O O O O
hydrogel hydrogel O O B O B
microspheres microsphere O O O O O
based base O O O O O
on on O O O O O
hydroxyethyl hydroxyethyl O O B O B
starch starch B O I O I
- _ B O O O O
hydroxyethyl hydroxyethyl I O B O B
methacrylate methacrylate I O I B I
( _ O O O O O
HES-HEMA hes_hema O O O O O
) _ O O O O O