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Overall , our findings suggest that ursolic acid induced apoptosis in HepG2 cells via AMPK activation and GSK3 beta phosphorylation as a potent chemopreventive agent .
 Chemical: ursolic acid
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: ursolic acid