12508
Heterogeneous cationic liposomes modified with 3 beta - { N - [ ( N ' , N ' - dimethylamino ) ethyl ] carbamoyl } cholesterol can induce partial conformational changes in messenger RNA and regulate translation in an Escherichia coli cell - free translation system .
 3 beta - { N - [ ( N ' , N ' - dimethylamino ) ethyl ] carbamoyl } cholesterol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 3 beta - { N - [ ( N ' , N ' - dimethylamino ) ethyl ] carbamoyl } cholesterol