16790
Interactions of binuclear ruthenium ( II ) complexes with oligonucleotides in hydrogel matrix : enantioselective threading intercalation into GC context .
 ruthenium ( II )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ruthenium ( II )