21278
Aphanamgrandiol A ( 1 ) , a novel triterpenoid with a bicyclo [ 3 , 2 , 1 ] octane ring skeleton produced by 2 , 3 - ring opening and 2 , 6 - ring closure , was isolated from the stems of Aphanamixis grandifolia .
 Aphanamgrandiol A, triterpenoid, bicyclo [ 3 , 2 , 1 ] octane
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Aphanamgrandiol A, triterpenoid, bicyclo [ 3 , 2 , 1 ] octane