27924
Abstract Objective : The objective of this study is to test the hypothesis that the phase transition temperature ( Tm ) , the main property of liposomes , can be easily controlled by changing the molar ratio of hydrogenated soy phosphatidylcholine ( HSPC ) and 1 , 2 - dipalmitoyl - sn - glycero - 3 - phosphacholine ( DPPC ) after drug encapsulation .
 phosphatidylcholine, 1 , 2 - dipalmitoyl - sn - glycero - 3 - phosphacholine, DPPC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 phosphatidylcholine, 1 , 2 - dipalmitoyl - sn - glycero - 3 - phosphacholine, DPPC