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Table 4 Number of chemical entities from the CHEMDNER corpus not mapped to ChEBI.

From: Improving chemical entity recognition through h-index based semantic similarity

Type Systematic Identifier Formula Trivial Abbreviation Family Multiple
Unmapped 3382 1156 3972 3622 4181 1690 91
  (25.1%) (88.2%) (46.3%) (20.3%) (46.2%) (20.3%) (23.3%)
Total 13472 1311 8585 17802 9059 8313 390