9477
According to chiral HPLC analysis , the 2 - ( 4 - hydroxyphenyl ) propionic acid obtained from the bacterium was optically active .
 Chemical: 2 - ( 4 - hydroxyphenyl ) propionic acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 2 - ( 4 - hydroxyphenyl ) propionic acid