12353
The aim of this study was to evaluate inhibitory effect of four anthocyanidins ( delphinidin , cyanidin , malvidin and pelargonidin ) on three families of important drug - metabolizing enzymes : carbonyl reductases ( CBRs ) , glutathione S - transferases ( GSTs ) and UDP - glucuronosyltransferases ( UGT ) .
 anthocyanidins, delphinidin, cyanidin, malvidin, pelargonidin, carbonyl, glutathione, S, UDP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 anthocyanidins, delphinidin, cyanidin, malvidin, pelargonidin, carbonyl, glutathione, S, UDP