3828
Four flavonoidal compounds were isolated and identified as naringenin , aromadendrin , apigenin and 4 ' - O - methoxy - luteolin - 7 - O - rhamnoglucoside , each demonstrating antiulcerogenic activity with curative ratios ranging from 75 . 78 % to 88 . 23 % .
 flavonoidal, naringenin, aromadendrin, apigenin, 4 ' - O - methoxy - luteolin - 7 - O - rhamnoglucoside
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 flavonoidal, naringenin, aromadendrin, apigenin, 4 ' - O - methoxy - luteolin - 7 - O - rhamnoglucoside