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A common intermediate 4 , 5 , 6 - trimethoxybiphenyl - 2 - carbaldehydes was employed to generate the two scaffolds .
 4 , 5 , 6 - trimethoxybiphenyl - 2 - carbaldehydes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 4 , 5 , 6 - trimethoxybiphenyl - 2 - carbaldehydes