13485
All the samples contained 3 , 3 , 5 , 5 , 8 , 8 - hexamethyl - 7 - oxabicyclo [ 4 . 3 . 0 ] non - 1 ( 6 ) - ene - 2 , 4 - dione ( up to 4 . 9 % ) .
 Chemical: 3 , 3 , 5 , 5 , 8 , 8 - hexamethyl - 7 - oxabicyclo [ 4 . 3 . 0 ] non - 1 ( 6 ) - ene - 2 , 4 - dione
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: 3 , 3 , 5 , 5 , 8 , 8 - hexamethyl - 7 - oxabicyclo [ 4 . 3 . 0 ] non - 1 ( 6 ) - ene - 2 , 4 - dione