8597
Ten new schisantherin A derivatives ( 11 - 20 ) and 6 , 7 - secoschisantherol A ( 2b ) were synthesized .
 schisantherin A, 6 , 7 - secoschisantherol A
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 schisantherin A, 6 , 7 - secoschisantherol A