7430
The group of catalytic topoII inhibitors is classified into four types according to their molecular mechanism of action : inhibitors that bind to the ATP binding site , inhibitors that prevent the ATP hydrolysis step and trap the enzyme in a closed clamp , inhibitors that block the DNA cleavage and inhibitors that prevent the enzyme binding to the DNA .
 ATP, ATP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ATP, ATP