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HPLC analysis revealed gallic acid , trans - cinnamic acid , p - coumaric acid , and ferulic acid as the main compounds .
 Chemical: gallic acid; Chemical: trans - cinnamic acid; Chemical: p - coumaric acid; Chemical: ferulic 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: gallic acid; Chemical: trans - cinnamic acid; Chemical: p - coumaric acid; Chemical: ferulic acid