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As late as the 1840 s , and despite Friedrich Wöhler 's synthesis of urea in 1828 , some chemists still believed in the doctrine of vitalism , according to which a special life-force was necessary to create " organic " ( i.e. , in its original meaning , biologically derived ) compounds .
 Friedrich Wöhler
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Friedrich Wöhler