21005
Various amides and benzoimidazoles at C - 3 position were investigated .
 Chemical: amides; Chemical: benzoimidazoles
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: amides, benzoimidazoles 
Answer:
 Chemical: amides; Chemical: benzoimidazoles