13086
Evidence for metal - surface interactions and their role in stabilizing well - defined immobilized Ru - NHC alkene metathesis catalysts .
 Chemical: Ru - NHC alkene
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: Ru - NHC alkene