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Table 15 Sample tokens and their chemical segment composition.

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

Token initially recognised as non-chemical Chemical basic segments Ratio
polycalcium poly, calcium 1.0
2-methoxyestradiol meth, oxy, estra, di, ol 0.89
palytoxin toxin 0.56