4453
In this present study , we aimed to compare the protective effect of ethanol extract of Cortex Phellodendri chinensis ( ECPC ) and Cortex Phellodendri Amurensis ( ECPA ) against beta - amyloid ( A beta ) - induced neurotoxicity in PC12 cells , a typical model of Alzheimer ' s disease .
 Chemical: ethanol
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: ethanol