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Pharmacology of gamma - aminobutyric acidA receptor complex after the in vivo administration of the anxioselective and anticonvulsant beta - carboline derivative abecarnil .
 Chemical: gamma - aminobutyric acidA; Chemical: beta - carboline; Chemical: abecarnil
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: gamma - aminobutyric acidA; Chemical: beta - carboline; Chemical: abecarnil