Chemical substance (14)   
   PubChem (1)   
   ChEBI (1)   
   3DMET (1)   
   HMDB (1)   
   MASSBANK (8)   
   NIKKAJI (1)   
   PDB-CCD (1)   
Chemical reaction (2)   
   KEGG ENZYME (1)   
   KEGG REACTION (1)   
All databases (16)   

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