30511
The results demonstrated that ring A , B , C and the left side of ring E of EA are highly conserved , while ring D and the right side of ring E of EA are flexible .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None