6991
The purpose of this investigation was to examine the antibacterial and synergistic effect of naturally occurring flavonoids , apigenin , quercetin , naringenin and ceftazidime when use singly and in combination against ceftazidime - resistant Enterobacter cloacae strains by minimum inhibitory concentration ( MIC ) , checkerboard and viable count methods .
 Chemical: flavonoids; Chemical: apigenin; Chemical: quercetin; Chemical: naringenin; Chemical: ceftazidime; Chemical: ceftazidime
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: flavonoids; Chemical: apigenin; Chemical: quercetin; Chemical: naringenin; Chemical: ceftazidime; Chemical: ceftazidime