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The Amazonian Croton lechleri stem bark essential oil was tested for its anti - mutagenic potential by performing the Ames test against heterocyclic amines ( HCAs ) , in continuing research on applicative functional profile of this phytocomplex as food ingredient ( Rossi et al . , 2011 ) .
 Chemical: heterocyclic amines; Chemical: HCAs
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: heterocyclic amines; Chemical: HCAs