23385
The polymer degrades into ester oligomers of 2 - 4 ricinoleic acid units which further degrade to ricinoleic acid , a natural fatty acid .
 Chemical: ricinoleic acid; Chemical: ricinoleic acid; Chemical: fatty acid
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: ricinoleic acid; Chemical: ricinoleic acid; Chemical: fatty acid