16886
Ruthenium ( II ) polypyridyl complexes as G - quadruplex inducing and stabilizing ligands in telomeric DNA .
 Chemical: Ruthenium ( II ) polypyridyl
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: Ruthenium ( II ) polypyridyl 
Answer:
 Chemical: Ruthenium ( II ) polypyridyl