13919
Cleavage of DNA by proton - coupled electron transfer to a photoexcited , hydrated Ru ( II ) 1 , 10 - phenanthroline - 5 , 6 - dione complex .
 Chemical: hydrated Ru ( II ) 1 , 10 - phenanthroline - 5 , 6 - dione
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: hydrated Ru ( II ) 1 , 10 - phenanthroline - 5 , 6 - dione