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Table 4 Effect of standardization on the ambiguity of non-systematic identifiers (in  %) within databases

From: Ambiguity of non-systematic chemical identifiers within and between small-molecule databases

Database FICTS uICTS FuCTS FIuTS FICuS FICTu
HMDB 15.2 15.2 15.2 15.2 15.2 15.2
TTD 4.6 1.8 2.1 2.0 2.1 2.1
ChEMBL 3.9 2.0 3.8 3.9 3.9 3.4
NPC 3.1 2.7 2.7 2.7 2.7 2.7
ChemSpider 2.5 2.3 2.5 2.5 2.2 1.9
ChEBI 2.0 1.8 1.9 1.4 1.8 1.6
PubChem 1.4 1.2 1.3 1.3 0.6 0.6
ChemSpider-V 0.6 0.6 0.6 0.6 0.6 0.3
DrugBank 0.1 0.1 0.1 0.1 0.1 0.1