16768
The two analogues with the highest antimigratory activities , sipholenol A 4 beta - 4 - chlorobenzoate and 19 , 20 - anhydrosipholenol A 4 beta - 4 - chlorobenzoate esters , also exhibited the most potent inhibition of PTK6 phosphorylation inhibition .
 sipholenol A 4 beta - 4 - chlorobenzoate, 19 , 20 - anhydrosipholenol A 4 beta - 4 - chlorobenzoate, esters
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 sipholenol A 4 beta - 4 - chlorobenzoate, 19 , 20 - anhydrosipholenol A 4 beta - 4 - chlorobenzoate, esters