13925
Whereas [ Ru ( phen ) ( 3 ) ] ( 2 + ) * does not show direct DNA cleavage , the deprotonated form of 1H ( 2 ) O ( 2 + ) * does via a proton - coupled electron transfer ( PCET ) mechanism where the peripheral basic oxygen sites act as the proton acceptor .
 Chemical: [ Ru ( phen ) ( 3 ) ] ( 2 + ); Chemical: 1H ( 2 ) O ( 2 + ); 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: [ Ru ( phen ) ( 3 ) ] ( 2 + ); Chemical: 1H ( 2 ) O ( 2 + ); Chemical: oxygen