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1 . In this study , hydrophilic interaction liquid chromatography ( HILIC ) , radiochemical activity monitoring and linear trap quadrupole orbitrap mass spectrometry ( MS ) and tandem mass spectrometry ( MS / MS ) were used to identify the metabolites of a highly polar novel gamma - aminobutyric acid type - B receptor agonist , lesogaberan , in rats .
 Chemical: gamma - aminobutyric acid; Chemical: lesogaberan
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: gamma - aminobutyric acid; Chemical: lesogaberan