54088
During his Ph.D. he synthesized in 1887 2,8-Dimethyl-6H ,12 H-5 ,11 - methanodibenzo - [ b , f ] [ 1,5 ] diazocine from p-toluidine and formaldehyde .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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