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The canthines represent a fairly large subclass of beta - carboline alkaloids , with the first members described 75 years ago .
 Chemical: canthines; Chemical: beta - carboline alkaloids
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: canthines; Chemical: beta - carboline alkaloids