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Recently , PBDEs with < 5 Br substitutions ( i . e . , 2 , 2 ' , 4 , 4 ' - tetrabromodiphenyl ether [ BDE - 47 ] and 2 , 2 ' , 4 , 5 ' - tetrabromodiphenyl ether [ BDE - 49 ] ) have gained interest because of their high bioaccumulation .
 Chemical: PBDEs; Chemical: Br; Chemical: 2 , 2 ' , 4 , 4 ' - tetrabromodiphenyl ether; Chemical: BDE - 47; Chemical: 2 , 2 ' , 4 , 5 ' - tetrabromodiphenyl ether; Chemical: BDE - 49
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PBDEs, Br, 2 , 2 ' , 4 , 4 ' - tetrabromodiphenyl ether, BDE - 47, 2 , 2 ' , 4 , 5 ' - tetrabromodiphenyl ether, BDE - 49 
Answer:
 Chemical: PBDEs; Chemical: Br; Chemical: 2 , 2 ' , 4 , 4 ' - tetrabromodiphenyl ether; Chemical: BDE - 47; Chemical: 2 , 2 ' , 4 , 5 ' - tetrabromodiphenyl ether; Chemical: BDE - 49