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The accumulated analogues from the Delta fosK and Delta fosM mutant strains possessed a malonyl ester moiety that suggested that all the post - PKS modification steps in FST biosynthesis occur with the polyketide chain bearing a malonyl ester at the C - 3 position , with formation of the unsaturated six - membered lactone as the last step in FST biosynthesis .
 Chemical: malonyl ester; Chemical: malonyl ester; Chemical: lactone; Chemical: FST
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: malonyl ester; Chemical: malonyl ester; Chemical: lactone; Chemical: FST