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Determining the CORRECT chemical structure associated with a chemical name is a major challenge using online Public Domain databases. Using Vitamin K as an example Antony Williams shows how finding the correct chemical structure can be a major challenge. Wikipedia has it wrong. PubChem has 10 chemicals called Vitamin K1. Most other public domain databases have it wrong including Wolfram Alpha, DrugBank and KEGG. Congrats to ChEMBL and ChemSpider for having it right. This confirmation uses the assertion that the structure cited in the Merck Index and CAS's Common Chemistry is correct.