20340
In the absence of superoxide dismutase ( in sod1 Delta mutant strain ) sensitivity to the essential oil and nerolidol increased indicating that this oil and nerolidol are generating reactive oxygen species ( ROS ) .
 Chemical: superoxide; Chemical: nerolidol; Chemical: nerolidol; 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: superoxide; Chemical: nerolidol; Chemical: nerolidol; Chemical: oxygen