30105
The 3,3 isomer was formed in two steps by reaction of 1,4-bis ( trimethylsilyl ) buta-1 ,3 - diene with methyllithium and dichloromethane , introducing two cyclopropane rings into the molecule .
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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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