8173
The sulfonylurea herbicides exert their activity by inhibiting plant acetohydroxyacid synthase ( AHAS ) , the first enzyme in the branched - chain amino acid biosynthesis pathway .
 Chemical: sulfonylurea; Chemical: amino acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: sulfonylurea; Chemical: amino acid