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Octanal and 2 - bromoacetic acid have been used as the starting materials .
 Chemical: Octanal; Chemical: 2 - bromoacetic acid
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: Octanal, 2 - bromoacetic acid 
Answer:
 Chemical: Octanal; Chemical: 2 - bromoacetic acid