7553
Pretreatment with E ( 2 ) prevented MPTP opening induced by H ( 2 ) O ( 2 ) , which preceded loss of mitochondrial membrane potential .
 Chemical: H ( 2 ) O ( 2 )
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: H ( 2 ) O ( 2 )