20385
The structural characterization of the oligo ( hydroxyalkanoate ) diols was conducted using NMR and ESI - mass spectrometry analyses , which confirmed that oligomers that were terminated by two hydroxyl end groups were formed .
 Chemical: oligo ( hydroxyalkanoate ) diols; Chemical: hydroxyl
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: oligo ( hydroxyalkanoate ) diols, hydroxyl 
Answer:
 Chemical: oligo ( hydroxyalkanoate ) diols; Chemical: hydroxyl