13920
Visible light irradiation of a ruthenium ( II ) quinone - containing complex , [ ( phen ) ( 2 ) Ru ( phendione ) ] ( 2 + ) ( 1 ( 2 + ) ) , where phendione = 1 , 10 - phenanthroline - 5 , 6 - dione , leads to DNA cleavage in an oxygen independent manner .
 Chemical: ruthenium ( II ); Chemical: quinone; Chemical: [ ( phen ) ( 2 ) Ru ( phendione ) ] ( 2 + ); Chemical: phendione; Chemical: 1 , 10 - phenanthroline - 5 , 6 - dione; Chemical: oxygen
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: ruthenium ( II ); Chemical: quinone; Chemical: [ ( phen ) ( 2 ) Ru ( phendione ) ] ( 2 + ); Chemical: phendione; Chemical: 1 , 10 - phenanthroline - 5 , 6 - dione; Chemical: oxygen