25241
While three flavonoids , quercetin - 3 - O - sambubioside , rutin and isoquercitrin were purified by petroleum ether - ethyl acetate - methanol - water ( 1 : 5 : 1 : 5 , v / v / v / v ) .
 Chemical: flavonoids; Chemical: quercetin - 3 - O - sambubioside; Chemical: rutin; Chemical: isoquercitrin; Chemical: petroleum ether; Chemical: ethyl acetate; Chemical: methanol
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: quercetin - 3 - O - sambubioside; Chemical: rutin; Chemical: isoquercitrin; Chemical: petroleum ether; Chemical: ethyl acetate; Chemical: methanol