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Table 3 Number of shared non-systematic identifiers between databases, ambiguity of the shared identifiers (first figure in parentheses, in italics), and the percentage of shared identifiers that are ambiguous within at least one of the databases (second figure in parentheses)

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

Database ChEBI ChEMBL ChemSpider ChemSpider-V DrugBank HMDB NPC PubChem
ChEMBL 1886 (39.5/18.2)        
ChemSpider 28,281 (30.9/24.1) 23,584 (29.9/22.3)       
ChemSpider-V 5081 (39.9/9.8) 4303 (43.6/16.6)       
DrugBank 2981 (28.7/3.4) 4108 (39.6/14.7) 19,222 (50.7/32.0) 6985 (45.2/6.7)     
HMDB 4529 (49.6/10.6) 2325 (48.4/17.7) 27,608 (57.3/29.5) 11,774 (43.9/8.8) 5515 (30.7/5.2)    
NPC 5516 (40.7/6.1) 6858 (46.4/15.1) 62,527 (60.2/26.8) 18,709 (48.6/7.4) 22,377 (21.9/2.0) 6815 (44.4/7.4)   
PubChem 24,331 (36.9/26.1) 25,607 (33.1/28.9) 2,275,338 (17.7/8.5) 99,334 (41.6/19.2) 24,929 (46.8/39.4) 35,905 (43.3/28.3) 68,280 (49.8/29.6)  
TTD 4854 (27.7/7.6) 5019 (36.9/16.9) 50,182 (32.3/18.4) 8305 (40.3/10.4) 17,232 (18.2/6.8) 6256 (43.0/11.2) 23,669 (22.4/6.9) 98,853 (25.4/23.0)