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more general categories information about this item 10. Biology and Chemistry 10. Biology and Chemistry Biology and Chemistry (144) Biochemistry (39) description: NCBI PubChem is a database of chemical molecules and their activities against biological assays. Millions of compound structures and descriptive datasets can be freely downloaded via FTP. PubChem contains substance descriptions and small molecules with fewer than 1000 atoms and 1000 bonds. AFDSI imports NCBI PubChem information. complete name: US NCBI PubChem