21524
Compound 1 promotes a dose - dependent apoptosis in HepG2 cells and the apoptosis is associated with an increase in intracellular reactive oxygen species ( ROS ) production and reduction of mitochondrial membrane potential ( MMP ) .
 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: oxygen