30145
2 , 2 ' , 3 , 3 ' , 4 , 4 ' , 5 , 5 ' , 6 , 6 ' - decabromodiphenyl ether ( BDE209 ) is commercially most important both in the production and in the use of polybrominated diphenyl ethers ( PBDEs ) .
 Chemical: 2 , 2 ' , 3 , 3 ' , 4 , 4 ' , 5 , 5 ' , 6 , 6 ' - decabromodiphenyl ether; Chemical: BDE209; Chemical: polybrominated diphenyl ethers; Chemical: PBDEs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 2 , 2 ' , 3 , 3 ' , 4 , 4 ' , 5 , 5 ' , 6 , 6 ' - decabromodiphenyl ether; Chemical: BDE209; Chemical: polybrominated diphenyl ethers; Chemical: PBDEs