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Table 1 Number of compounds and non-systematic identifiers in different chemical databases

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

Database Compounds Identifiers Identifiers/compound
PubChem 4,232,875 15,211,133 3.6
ChemSpider 6,646,902 10,063,709 1.5
ChemSpider-V 654,052 850,601 1.3
HMDB 37,761 308,733 8.2
NPC 14,814 131,290 8.9
TTD 2977 105,407 35.4
ChEBI 15,633 41,956 2.7
ChEMBL 21,398 28,011 1.3
DrugBank 3769 26,780 7.1