23663
2 - Amino - 9H - pyrido [ 2 , 3 - b ] indole ( A alpha C ) is an abundant heterocyclic aromatic amine present in tobacco smoke .
 Chemical: 2 - Amino - 9H - pyrido [ 2 , 3 - b ] indole; Chemical: heterocyclic aromatic amine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 2 - Amino - 9H - pyrido [ 2 , 3 - b ] indole; Chemical: heterocyclic aromatic amine