10527
Efforts to extend this reaction to greener or safer solvents showed that most ether - based solvents are unsatisfactory .
 Chemical: ether
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: ether 
Answer:
 Chemical: ether