16539
Here , we show that the anti - apoptotic activity of [ 6 ] - shogaol in astrocytes following exposure to hydrogen peroxide ( H ( 2 ) O ( 2 ) ) involves a marked up - regulation of neurotrophic factors such as nerve growth factor , glial cell line - derived neurotrophic factor , and brain - derived neurotrophic factor .
 Chemical: [ 6 ] - shogaol; Chemical: hydrogen peroxide; 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: [ 6 ] - shogaol; Chemical: hydrogen peroxide; Chemical: H ( 2 ) O ( 2 )