6765
The advantages of both nanohybrids are encountered in a third one , poly [ ( N - vinylpyrrolidone ) - co - ( vinyl acetate ) ] / C ( 60 ) , which has linear grafts without hydroxyl groups , and shows a better photodynamic activity .
 Chemical: poly [ ( N - vinylpyrrolidone ) - co - ( vinyl acetate ) ]; Chemical: C ( 60 ); Chemical: hydroxyl
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: poly [ ( N - vinylpyrrolidone ) - co - ( vinyl acetate ) ]; Chemical: C ( 60 ); Chemical: hydroxyl