6452
Supramolecular hydrogels with reverse thermal gelation properties from ( oligo ) tyrosine containing block copolymers .
 Chemical: ( oligo ) tyrosine
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: ( oligo ) tyrosine