26117
MATERIALS AND METHODS : A simple , sensitive and selective method for simultaneous determination of four flavones of Glycyrrhiza in rat plasma , i . e . , liquiritin , isoliquiritin , liquiritigenin , isoliquiritigenin , by high performance liquid chromato - graphy - tandem mass spectrometry ( HPLC - MS ) with negative electrospray ionization mode , was developed and validated .
 Chemical: flavones; Chemical: liquiritin; Chemical: isoliquiritin; Chemical: liquiritigenin; Chemical: isoliquiritigenin
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: flavones; Chemical: liquiritin; Chemical: isoliquiritin; Chemical: liquiritigenin; Chemical: isoliquiritigenin