12940
Compounds 1 - 8 , designated as phorbaketals D - K , possess a spiroketal - modified benzopyran moiety such as phorbaketal A , and their structural variations are due to oxidation and / or reduction of the tricyclic core or the side chain .
 Chemical: phorbaketals D - K; Chemical: spiroketal; Chemical: benzopyran; Chemical: phorbaketal A
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: phorbaketals D - K; Chemical: spiroketal; Chemical: benzopyran; Chemical: phorbaketal A