12406
Assessment of permethylated transition - metal sandwich complexes as internal reference redox systems in ionic liquids .
 Chemical: permethylated transition - metal
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: permethylated transition - metal 
Answer:
 Chemical: permethylated transition - metal