22507
Then , thermosensitive microspheres were prepared from preformed copolymers by chemical cross - linking of hydroxyl groups with glutaraldehyde at a temperature situated slightly below LCST of the copolymer solution .
 Chemical: hydroxyl; Chemical: glutaraldehyde
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: hydroxyl; Chemical: glutaraldehyde