24662
The O - methyl free derivatives used in the study were fully trimethylated ( 100 % ) N , N , N - trimethyl chitosan ( TMC ) and N - propyl - ( QuatPropyl ) , N - butyl - ( QuatButyl ) and N - hexyl ( QuatHexyl ) - N , N - dimethyl chitosan , with 85 - 91 % degree of quaternization .
 Chemical: O - methyl; Chemical: N , N , N - trimethyl; Chemical: N - propyl - ( QuatPropyl ); Chemical: N - butyl - ( QuatButyl ); Chemical: N - hexyl ( QuatHexyl ) - N , N - dimethyl
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: O - methyl; Chemical: N , N , N - trimethyl; Chemical: N - propyl - ( QuatPropyl ); Chemical: N - butyl - ( QuatButyl ); Chemical: N - hexyl ( QuatHexyl ) - N , N - dimethyl