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Table 2 Ambiguity of non-systematic identifiers and the average number of compounds per ambiguous identifier, within databases

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

Database Unique identifiers Ambiguous identifiers Ambiguity (%) Compounds/ambiguous identifier
HMDB 173,455 26,430 15.2 6.1
TTD 100,570 4607 4.6 2.1
ChEMBL 26,910 1050 3.9 2.1
NPC 112,717 3455 3.1 2.1
ChemSpider 9,691,277 245,541 2.5 2.5
ChEBI 41,023 827 2.0 2.1
PubChem 14,937,728 201,621 1.3 2.4
ChemSpider-V 842,128 5401 0.6 2.3
DrugBank 26,759 20 0.1 2.1