20167
In antioxidant assays all of the tested meroterpenes , and in particular cystodiones A ( 1 ) and B ( 2 ) , 6 - cis - amentadione - 1 ' - methyl ether ( 7 ) , and amentadione - 1 ' - methyl ether ( 8 ) , exhibited strong radical - scavenging activity .
 Chemical: meroterpenes; Chemical: cystodiones A ( 1 ) and B; Chemical: 6 - cis - amentadione - 1 ' - methyl ether; Chemical: amentadione - 1 ' - methyl ether
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: meroterpenes; Chemical: cystodiones A ( 1 ) and B; Chemical: 6 - cis - amentadione - 1 ' - methyl ether; Chemical: amentadione - 1 ' - methyl ether