​​The Cambridge Crystallographic Data Centre (CCDC).
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Where do I request data not included in the CSD?


​Data for crystal structures of compounds not included in the Cambridge Structural Database (CSD) or the Inorganic Crystal Structure Database (ICSD) are collected by the databases shown below:

- Protein Data Bank (PDB) https://www.rcsb.org/ for polypeptides and polysaccharides having more than 24 units
- Nucleic Acids Data Bank http://ndbserver.rutgers.edu/ for oligonucleotides
- The International Centre for Diffraction Data (ICDD) http://www.icdd.com/ for powder diffraction data without atomic coordinates
- Incommensurate Structures Database (ICSDB) http://webbdcrista1.ehu.es/incstrdb/