9478
To determine the absolute stereochemistry of the microbial product , we prepared ( S ) - 2 - ( 4 - hydroxyphenyl ) propionic acid from ( S ) - 2 - phenylpropionic and concluded that the microbial product had an R - configuration by chiral HPLC analysis .
 Chemical: ( S ) - 2 - ( 4 - hydroxyphenyl ) propionic acid; Chemical: ( S ) - 2 - phenylpropionic
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: ( S ) - 2 - ( 4 - hydroxyphenyl ) propionic acid; Chemical: ( S ) - 2 - phenylpropionic